borg number one
Legend
Equalized for equipment, prime Borg, McEnroe, and/or Connors would compete very well in today's game. The sheer physicality is different nowadays, especially due to the demands of today's baseline-oriented play and the technology utilized, but guys like McEnroe were extremely versatile, so they would figure out ways to compete (all three were Competitive with a capital "C"). Of the three, I think Borg may very well have fared the best in today's climate, given all of his strengths. Why? There are very few players even today who could have dealt with his speed, fitness, and yes, even his underrated strength. So, of the three, he is the best equipped to have done well in today's climate. Back then, Borg was winning with a style of play that predominates today, and that was with old technology, and on the faster grass courts at Wimbledon. I also think Lendl would do well in today's climate. So, of the four, if they played today, I'd go with Borg, Lendl, and then Connors/McEnroe. By 1980-1981, it was so intriquing, with Borg, McEnroe, Connors, Lendl, and Vilas. Now that's "depth at the very top" so to speak.