After winning their duel here last year, the American has dropped three successive meetings to the now world No. 1.

The incoming Toronto title holder halted Taylor Townsend after rallying past Karolina Muchova earlier Friday.

Tiafoe is producing his best tennis of the season and he now faces a competitor who's played just two matches since May.

The 21-year-old has won the past two Grand Slam tournaments—the French Open and Wimbledon—and is trying to win a singles medal for Spain at his first Summer Games.

Lehecka hasn't played since retiring in the semifinals of the Mutua Madrid Open.

At this point in the 14-time champion's career, he is most eager for one particular spectator to get to watch him play: His one-year-old son.

Plus, Dominic Thiem headlines Day 1 of Roland Garros qualifying Monday.

This week on Served with Andy Roddick, he, Jon Wertheim and guest Dr. Joshua S. Dines discuss the challenges players face at all levels of competition.

The Canadian advanced to his first Masters 1000 final Friday after the Czech's bid was dashed by a sudden back problem.

The eighth-ranked Rublev entered Madrid on a four-game losing streak after early exits in Indian Wells, Miami, Monte Carlo and Barcelona before winning five in a row in the Spanish capital.