Competing for the first time since the Rotterdam early loss, Alexander Zverev toppled the young Spaniard Carlos Alcaraz 6-3, 6-1 in an hour and 24 minutes. Alexander fired 11 aces and saved three out of four break chances to keep the pressure on the other side of the net.
Carlos gave his best to stay in touch with the better-ranked opponent, leading 3-2 before Alexander claimed nine of the last ten games. The opening set lasted for almost an hour, with 15 break points up for grabs. Carlos fended off four break points in the encounter's opening game and landed a perfect drop shot winner a few minutes later for a break and a 2-0 lead.
Alexander pulled the break back in the next game and repelled three break opportunities in game four to lock the result at 2-2 after grueling half an hour. The German fired a forehand winner in the seventh game to open his first advantage and closed the set with another break in game nine.
Carried by this boost, Zverev produced four comfortable holds in set number two and stole the rival's serve in games four and six. Serving for the victory at 5-1, Alexander fired an ace to seal the deal and advance into the second round.
The young American Sebastian Korda toppled Marin Cilic 7-5, 6-2 in an hour and 40 minutes, trailing 5-2 in the opener before rattling off 11 of the last 13 games to seal the deal in style. Korda repelled 12 out of 15 break chances, eight of those in the opening two service games, suffering those breaks in set number two but erasing those with no less than six straight breaks of serve that carried him through.
Alexander Zverev and Felix Auger-Aliassime are through to the second round.
The 7th seed Felix Auger-Aliassime took down Tennys Sandgren 6-3, 7-6 in an hour and 42 minutes, losing serve twice and breaking the American thrice to cross the finish line first.
At 3-3 in the opener, Felix grabbed three straight games to grab it 6-3 and gain a boost ahead of set number two. Sandgren came from 5-3 down and leveled the score at 5-5 in the last moment to prolong the set. The tie break saw 18 points and six match points for Felix, who wasted the opening five before seizing the sixth at 9-8 that carried him over the top.