Novak Djokovic

Watch for the way Novak Djokovic slides into return position, then snaps his two-handed backhand crosscourt with sudden, flat aim. At 39, he covers the baseline in stretches instead of bursts, letting opponents punch first before he shifts from neutral defense to front-foot aggression.

The rank 5 sits far from his peak, but 45 wins against 9 losses this season, at an 83 percent clip, still show a mind that rarely misses tactical openings. Serbia’s soon-to-be centurion of career titles plays angles even in rallies he appears to lose. For new eyes, track his legs: when he shuffles wide and flicks the passing shot, you are watching 99 career trophies condensed into one compact move.