The top seed Stefanos Tsitsipas is through to the second round in Acapulco following a 6-3, 6-1 victory over Benoit Paire in 68 minutes. The Greek saved both break points and kept the pressure on the other side of the court, stealing half of Paire's serving points and delivering four breaks that carried him through.
Stefanos grabbed a break in the second game thanks to a lucky net cord forehand winner and held at 30 to open a 3-0 gap. Both players served well in the rest of the set, and the Greek sealed it with a volley winner at 5-3. Paire hit a double fault at the beginning of the second set to suffer a break and fell 3-0 down following a wild backhand in game three.
Serving at 4-1, Stefanos saved two break points to extend the advantage and moved over the top with another break a few minutes later. The 4th seed Milos Raonic prevailed over Tommy Paul 7-6, 6-4 in an hour and 48 minutes, losing serve twice and producing three return games to seal the deal and reach the second round.
Paul saved two set points in the opening set's tenth game and had his chances in the tie break. Milos raced into an early lead in set number two and closed the duel despite some initial shot problems. Tommy had to dig deep in three consecutive service games in the first set, saving those set points at 4-5 to reach a tie break, where he erased two more set points at 4-6 to remain in touch.
Stefanos Tsitsipas and Milos Raonic made a winning start in Mexico.
Milos moved 7-6 ahead with an unreturned serve and clinched the opener with a forehand winner for a massive boost. The Canadian rattled off three straight return games at the beginning of the second set, moving 4-1 up when Paul netted a backhand in game five.
Tommy saved a match point in game eight with a lucky return winner and pulled one break back for more drama. With no room for mistakes, Milos held at 15 in game ten to finish the job and make a winning start. A teenager Lorenzo Musetti defeated the 3rd seed Diego Schwartzman 6-3, 2-6, 6-4 in two hours and 22 minutes for his first top-10 triumph.
Thanks to that second set, Diego won three points more than Lorenzo, although it wasn't enough to carry him through, falling 4-0 down in the decider and saving five match points before the youngster seized the sixth in game ten.