This for open era seems about right. But seriously people Lendl deserves to be over agassi he has 19 slam finals, more 30 more atp titles, much more weeks at 1#,etc. It seems about right except I switch Lendl with Agassi and connors with Mcenroe. In fact its always for me hard to determine who should be above.. If agassi or connors..Id even inclined to say jimmy, despite of andre versatility.. But it could go the other way around too.. Rosewall in open era list? Come on...
I rank them as follow: 1) Lendl 2) Connors 3) McEnroe 4) Agassi
Lendl won 8 slams, was in 11 other finals, 9 SF. He won also 7 WCT or Master Cup, and was in 4 other finals. He was in 9 straights master cup finals! He was ranked number 1 for 270 weeks. He was very consistent for a long time. He was also very good on all surfaces, from quick indoor to slow clay. He didn't won Wimbledon, but going through Edberg and Becker isn't a walk in the park.
Connors won 8 slams too (including 1 AO in a weaker field) and reached 7 other finals and 16 SF. He did that while playing the AO only twice and missed several RG in his prime years! He never won RG and frankly when your peak coincide with Borg, it's not your fault! But, like Agassi, he did win slams on hard, grass and clay (USO).
His longevity and consistency are incredible too. He is recorded as number 1 for 268 weeks, but their are several issue with this. Many believe that Vilas and Borg should have been ranked number 1 in his stead at some point.
McEnroe won 7 slams, reached 4 other finals and 8 SF, and like Connors without playing much of the AO, who wasn't a true major at the time. But he did perform quiet well in the fourth most important tournament of the season: He won 8 Master cups or WCT! He was number 1 for 170 weeks.
Agassi won 8 slams, reached 7 other finals, 10 SF, also while skipping several AO. But the tournament was huge at the time and all the best players where competing, which wasn't the case during Connors and McEnroe best years. He also one the Master cup once, the olympics, and of course has the calendar slam, which I feel is a bit overrated. Winning RG and Wimbledon once doesn't prove that he is more polyvalent than Lendl or Connors to me, who had harder competition on their weakest surface. Lendl had peak Edberg and Becker, Agassi won it just after their best years, and before Sampras best. His RG draw isn't the most impressive either. McEnroe and Connors had Borg, then Lendl and Wilander.
At last Agassi was ranked number 1 for 101 weeks, but was never as consistent as the other at the top: he should have been a fixture in the top 4 at least for all the 90's, but instead ended several years number 6, 7 or 8ish.
His longevity is very impressive tough, and while this post is a bit severe with him, it's mostly to give weight to an uncommon opinion that put him below McEnroe (despite him having less slams) and Lendl (despite him being a cold commie).
Agassi is the underachiever of the four and is ranked accordingly.