Paul is a 28-year-old who grew up in North Carolina and now goes up against No. 2 Carlos Alcaraz of Spain, the defending champion who got past No. 13 Ben Shelton of the U.S. 7-6 (8), 6-3, 4-6, 6-4.

If there's an indication about Tommy Paul's physical issues, just look at the serve numbers. So far in the match, the American's max serve speed is 140 mph. His first serve average speed is 114 ...