Both world No. 1s were among a slew of current top players and tennis legends who took to social media to celebrate the 20-time Grand Slam champion.

Monfils had already missed Roland Garros and Wimbledon due to injury, after beginning the season with a run to the Australian Open quarterfinals.

The top seeds from the Western & Southern Open kept the positive vibes from Canada going with an exchange of heartfelt compliments.

A foot spur that has bothered the 35-year-old Frenchman since Monte Carlo.

The two tennis stars broke the exciting news to the tennis world in tandem on Sunday morning.

“I would probably rate it as the best performance of the year,” said the world No. 1 after just his ninth match of the season.

It’s the best undefeated tour-level head-to-head record for a man in the entire Open Era.

Pegula and Andreescu have never met in a tour-level match. Which player advances to the quarterfinals Tuesday?

Before each day's play at the BNP Paribas Open, we'll break down three must-see matches.

Monfils scored his first win over a reigning world No. 1 since 2009, rallying from a set down to reach the BNP Paribas Open fourth round for a third time in a row.