Graf & Serena
Graf has more Grand Slam titles than Serena, more French Open, more Wimbledon, more US Open, more Masters, more weeks at n° 1, more year-ends at n° 1, more consecutive Grand Slam finals, a Golden Slam, defending all the Grand Slam at leats 2 times, made the final of all the Grand Slam at leats 5 times each (Serena has one fluke French Open & her sister no less

), more consecutive weeks in the top 2(from march '87 to june '97) more little Slam with 4, won all the Grand Slam on every surface at least 6 times each, better % W-L, more titles, better peak (88-89 is the greatest 2 seasons back-to-back with 7 slams + 1 final)
Serena has more Australian Open and a better Olympics resumé.
It is not even close. :?
The only reasons Serena has won so many slams since 2008 is because she didn't do much in in middle of the noughties, and also because the field is so
weak. Players such as Ivanovic, Jankovic, Safina and Wozniacki became n° 1. Do you think Evert, Navratilova or Graf would have let Manuela Maleeva or Mary Joe Fernandez becoming n° 1 in their prime?
And Serena has so many bad lost in her "prime" years :
2002: Shaughnessy, Schnyder, Rubin
2004: Petrova, Jidkova
2005: Jankovic (#28 ), Farina Elia, Schiavone, Craybas, Sun
2006: Hantuchova, Zvonareva (#50)
2007: Bammer, Chan, Schnyder (2 times), Chakvetadze
2008: Safina (#17), Srebotnik, Wozniak, Li (#30)
2009: Zakopalola, Schnyder, Schiavone (#45), Bammer, Petrova
2010: Petrova
2012: Makarova, Razzano
Steffi's prime was around '86 to '96. Only Bradtke in '93 and Coetzer in '95 were really bad. And Steffi is 5-0 & Jennifer Capriati in Grand Slam tournaments, Serena is 3-4. :?... while Capriati had better % W-L in the early 90's than in the early 00's.
To say that Serena is the best is just