What happened: Top-ranked Jannik Sinner was eliminated from the French Open in the second round, falling to 56th-ranked Juan Manuel Cerundolo. Sinner dropped 18 of the last 20 games of the match, collapsing from one game away from victory to defeat. He appeared to struggle with the heat at the venue as the match turned against him.

Why it matters: A second-round exit for the world's top-ranked player is a major upset at a Grand Slam and reshapes the men's draw at Roland Garros. The loss removes the tournament favorite and opens the field for lower-seeded contenders to make a deep run.

What to watch: Attention turns to how the rest of the men's draw opens up without the No. 1 seed. Watch whether Cerundolo can build on the breakthrough in the next round.