No. 3 seeded Andy Murray took down the talented young Australian Nick Kyrgios in four sets to advance to Round 2 at the US Open.
Roger Federer is onto the next round, as he topped Leonardo Mayer in straight sets on Tuesday.
Rafael Nadal cruised early, then survived a scare from the 18-year-old Borna Coric. Plus, all the results from Day 1 of the 2015 US Open.
Here's how to watch Day 2 at the US Open with Roger Federer and Andy Murray headlining the Tuesday slate of matches.
Serena Williams played for just 30 minutes in her first match, moving on to the second round after her opponent retired in the second set.
The top seed in the men's draw had no trouble on Monday as Novak Djokovic rolled in straight sets on Day 1 of the US Open.
Tommy Robredo got fancy on Monday.
2014 finalist and fourth ranked Kei Nishikori was upset by unranked Benoit Paire in the first round at the US Open.
Slovakia's Dominika Cibulkova defeated No. 7 Ana Ivanovic in three sets.
The No. 3 seed for the US Open has announced she will not compete in the US Open that begins tomorrow.