This a list of opportunities for the two to play against one another. In the instances when one failed to make the meeting with the other, I have awarded the former with a win. If a player skipped a tournament, I did not make that a loss. It is to be considered, however, that one of the two was consistently involved at the highest level.
Here is the list:
2003
1-0 (ATP Masters Series Madrid, Spain; 13.10.2003; SU; Indoor: Hard; Draw: 48 )
2-0 (Wimbledon, England; 23.06.2003; GS; Outdoor: Grass; Draw: 128 )
2004
3-0 (US Open, NY, U.S.A.; 30.08.2004; GS; Outdoor: Hard; Draw: 128 )
4-0 (ATP Masters Series Canada, Toronto, Canada; 26.07.2004; SU; Outdoor: Hard; Draw: 64)
4-1 (ATP Masters Series Miami, FL, U.S.A.; 22.03.2004; SU; Outdoor: Hard; Draw: 96)
5-1 (ATP Masters Series Indian Wells, California, USA; 08.03.2004; SU; Outdoor: Hard; Draw: 96)
6-1 (Dubai, U.A.E.; 01.03.2004; CS; Outdoor: Hard; Draw: 32)
7-1 (Australian Open, Australia; 19.01.2004; GS; Outdoor: Hard; Draw: 128 )
2005
8-1 (US Open, NY, U.S.A.; 29.08.2005; GS; Outdoor: Hard; Draw: 128 )
9-1 (ATP Masters Series Cincinnati, Ohio, USA; 15.08.2005; SU; Outdoor: Hard; Draw: 64)
10-1 (Wimbledon, England; 20.06.2005; GS; Outdoor: Grass; Draw: 128 )
11-1 (Halle, Germany; 06.06.2005; WS; Outdoor: Grass; Draw: 32)
11-2 (Roland Garros, France; 23.05.2005; GS; Outdoor: Clay; Draw: 128 )
11-3 (ATP Masters Series Monte Carlo, Monaco; 11.04.2005; SU; Outdoor: Clay; Draw: 64)
12-3 (ATP Masters Series Miami, FL, U.S.A.; 21.03.2005; SU; Outdoor: Hard; Draw: 96)
13-3 (Doha, Qatar; 03.01.2005; WS; Outdoor: Hard; Draw: 32)
2006
14-3 (Tennis Masters Cup, China; 13.11.2006; WC; Indoor: Hard; Draw: 8 )
15-3 (ATP Masters Series Madrid, Spain; 16.10.2006; SU; Indoor: Hard; Draw: 48 )
16-3 (US Open, NY, U.S.A.; 28.08.2006; GS; Outdoor: Hard; Draw: 128 )
17-3 (ATP Masters Series Canada, Toronto, Canada; 07.08.2006; SU; Outdoor: Hard; Draw: 64)
18-3 (Wimbledon, England; 26.06.2006; GS; Outdoor: Grass; Draw: 128 )
18-4 (Roland Garros, France; 29.05.2006; GS; Outdoor: Clay; Draw: 128 )
18-5 (ATP Masters Series Rome, Italy; 08.05.2006; SU; Outdoor: Clay; Draw: 64)
18-6 (ATP Masters Series Monte Carlo, Monaco; 17.04.2006; SU; Outdoor: Clay; Draw: 64)
19-6 (ATP Masters Series Miami, FL, U.S.A.; 20.03.2006; SU; Outdoor: Hard; Draw: 96)
20-6 (ATP Masters Series Indian Wells, CA, U.S.A.; 06.03.2006; SU; Outdoor: Hard; Draw: 96)
20-7 (Dubai, U.A.E.; 27.02.2006; CS; Outdoor: Hard; Draw: 32)
2007
21-7 (Tennis Masters Cup, China; 12.11.2007; WC; Indoor: Hard; Draw: 8 )
22-7 (US Open, NY, U.S.A.; 27.08.2007; GS; Outdoor: Hard; Draw: 128 )
23-7 (ATP Masters Series Cincinnati, OH, U.S.A.; 13.08.2007; SU; Outdoor: Hard; Draw: 56)
24-7 (Wimbledon, Great Britain; 25.06.2007; GS; Outdoor: Grass; Draw: 128 )
24-8 (Roland Garros, France; 28.05.2007; GS; Outdoor: Clay; Draw: 128 )
25-8 (ATP Masters Series Hamburg, Germany; 14.05.2007; SU; Outdoor: Clay; Draw: 56)
25-9 (ATP Masters Series Rome, Italy; 07.05.2007; SU; Outdoor: Clay; Draw: 56)
25-10 (ATP Masters Series Rome, Italy; 07.05.2007; SU; Outdoor: Clay; Draw: 56)
25-11 (ATP Masters Series Indian Wells, CA, U.S.A.; 05.03.2007; SU; Outdoor: Hard; Draw: 96)
26-11 (Dubai, U.A.E.; 26.02.2007; CS; Outdoor: Hard; Draw: 32)
27-11 (Australian Open, Australia; 15.01.2007; GS; Outdoor: Hard; Draw: 128 )
2008
28-11 (US Open, NY, U.S.A.; 25.08.2008; GS; Outdoor: Hard; Draw: 128 )
28-12 (Beijing Olympics, China; 11.08.2008; OL; Outdoor: Hard; Draw: 64)
28-13 (ATP Masters Series Canada, Toronto, Canada; 21.07.2008; SU; Outdoor: Hard; Draw: 56)
28-14 (Wimbledon, Great Britain; 23.06.2008; GS; Outdoor: Grass; Draw: 128 )
28-15 (Roland Garros, France; 25.05.2008; GS; Outdoor: Clay; Draw: 128 )
28-16 (ATP Masters Series Hamburg, Germany; 11.05.2008; SU; Outdoor: Clay; Draw: 56)
28-17 (ATP Masters Series Monte Carlo, Monaco; 20.04.2008; SU; Outdoor: Clay; Draw: 56)
2009
29-17 (US Open, NY, U.S.A.; 31.08.2009; GS; Outdoor: Hard; Draw: 128 )
30-17 (ATP World Tour Masters 1000 Cincinnati, OH, U.S.A.; 16.08.2009; 1000; Outdoor: Hard; Draw: 56)
31-17 (Roland Garros, France; 25.05.2009; GS; Outdoor: Clay; Draw: 128 )
32-17 (ATP World Tour Masters 1000 Madrid, Spain; 10.05.2009; 1000; Outdoor: Clay; Draw: 56)
32-18 (ATP World Tour Masters 1000 Rome, Italy; 27.04.2009; 1000; Outdoor: Clay; Draw: 56)
32-19 (ATP World Tour Masters 1000 Monte Carlo, Monaco; 12.04.2009; 1000; Outdoor: Clay; Draw: 56)
32-20 (ATP World Tour Masters 1000 Indian Wells, CA, U.S.A.; 12.03.2009; 1000; Outdoor: Hard; Draw: 96)
32-21 (Australian Open, Australia; 19.01.2009; GS; Outdoor: Hard; Draw: 128 )
2010
33-21 (Barclays ATP World Tour Finals, London, England; 21.11.2010; WC; Indoor: Hard; Draw: 8 )
34-21 (ATP World Tour Masters 1000 Shanghai, China; 10.10.2010; 1000; Outdoor: Hard; Draw: 56)
34-22 (US Open, NY, U.S.A.; 30.08.2010; GS; Outdoor: Hard; Draw: 128 )
35-22 (ATP World Tour Masters 1000 Cincinnati, OH, U.S.A.; 15.08.2010; 1000; Outdoor: Hard; Draw: 56)
36-22 (ATP World Tour Masters 1000 Canada, Toronto, Canada; 09.08.2010; 1000; Outdoor: Hard; Draw: 56)
36-23 (Wimbledon, Great Britain; 21.06.2010; GS; Outdoor: Grass; Draw: 128 )
36-24 (Roland Garros, France; 24.05.2010; GS; Outdoor: Clay; Draw: 128 )
36-25 (ATP World Tour Masters 1000 Madrid, Spain; 09.05.2010; 1000; Outdoor: Clay; Draw: 56)
36-26 (ATP World Tour Masters 1000 Rome, Italy; 25.04.2010; 1000; Outdoor: Clay; Draw: 56)
37-26 (Australian Open, Australia; 18.01.2010; GS; Outdoor: Hard; Draw: 128 )
37-27 (Doha, Qatar; 04.01.2010; 250; Outdoor: Hard; Draw: 32)
2011
38-27 (Barclays ATP World Tour Finals, Great Britain; 20.11.2011; WC; Indoor: Hard; Draw: 16)
38-28 (US Open, NY, U.S.A.; 29.08.2011; GS; Outdoor: Hard; Draw: 128 )
38-29 (Wimbledon, Great Britain; 20.06.2011; GS; Outdoor: Grass; Draw: 128 )
38-30 (Roland Garros, France; 22.05.2011; GS; Outdoor: Clay; Draw: 128 )
38-31 (ATP World Tour Masters 1000 Rome, Italy; 08.05.2011; 1000; Outdoor: Clay; Draw: 56)
38-32 (ATP World Tour Masters 1000 Madrid, Spain; 01.05.2011; 1000; Outdoor: Clay; Draw: 56)
38-33 (ATP World Tour Masters 1000 Monte Carlo, Monaco; 10.04.2011; 1000; Outdoor: Clay; Draw: 56)
38-34 (ATP World Tour Masters 1000 Miami, FL, U.S.A.; 23.03.2011; 1000; Outdoor: Hard; Draw: 96)
39-34 (ATP World Tour Masters 1000 Indian Wells, CA, U.S.A.; 10.03.2011; 1000; Outdoor: Hard; Draw: 96)
40-34 (Doha, Qatar; 03.01.2011; 250; Outdoor: Hard; Draw: 32)
2012
41-34 (Wimbledon, Great Britain; 25.06.2012; GS; Outdoor: Grass; Draw: 128 )
42-34 (Halle, Germany; 11.06.2012; 250; Outdoor: Grass; Draw: 28 )
42-35 (Roland Garros, France; 27.05.2012; GS; Outdoor: Clay; Draw: 128 )
42-36 (ATP World Tour Masters 1000 Rome, Italy; 13.05.2012; 1000; Outdoor: Clay; Draw: 56)
43-36 (ATP World Tour Masters 1000 Madrid, Spain; 06.05.2012; 1000; Outdoor: Clay; Draw: 56)
44-36 (ATP World Tour Masters 1000 Indian Wells, CA, U.S.A.; 08.03.2012; 1000; Outdoor: Hard; Draw: 96)
44-37 (Australian Open, Australia; 16.01.2012; GS; Outdoor: Hard; Draw: 128 )
2013
44-38 (Barclays ATP World Tour Finals, Great Britain; 04.11.2013; WC; Indoor: Hard; Draw: 8 )
44-39 (US Open, NY, U.S.A.; 26.08.2013; GS; Outdoor: Hard; Draw: 128 )
44-40 (ATP World Tour Masters 1000 Cincinnati, OH, U.S.A.; 11.08.2013; 1000; Outdoor: Hard; Draw: 56)
44-41 (Roland Garros, France; 27.05.2013; GS; Outdoor: Clay; Draw: 128 )
44-42 (ATP World Tour Masters 1000 Rome, Italy; 12.05.2013; 1000; Outdoor: Clay; Draw: 56)
44-43 (ATP World Tour Masters 1000 Madrid, Spain; 05.05.2013; 1000; Outdoor: Clay; Draw: 56)
44-44 (ATP World Tour Masters 1000 Indian Wells, CA, U.S.A.; 07.03.2013; 1000; Outdoor: Hard; Draw: 96)
2014
45-44 (ATP World Tour Masters 1000 Shanghai, Shanghai, China; 05.10.2014; 1000; Outdoor: Hard; Draw: 56)
46-44 (Wimbledon, Great Britain; 23.06.2014; GS; Outdoor: Grass; Draw: 128 )
47-44 (Halle, Germany; 09.06.2014; 250; Outdoor: Grass; Draw: 28 )
48-45 (Roland Garros, France; 26.05.2014; GS; Outdoor: Clay; Draw: 128 )
48-46 (ATP World Tour Masters 1000 Rome, Italy; 11.05.2014; 1000; Outdoor: Clay; Draw: 56)
49-46 (ATP World Tour Masters 1000 Monte Carlo, Monaco; 13.04.2014; 1000; Outdoor: Clay; Draw: 56)
49-47 (ATP World Tour Masters 1000 Miami, FL, U.S.A.; 19.03.2014; 1000; Outdoor: Hard; Draw: 96)
50-47 (ATP World Tour Masters 1000 Indian Wells, CA, U.S.A.; 06.03.2014; 1000; Outdoor: Hard; Draw: 96)
50-48 (Australian Open, Australia; 13.01.2014; GS; Outdoor: Hard; Draw: 128 )