(Photo credit: Mike Frey-Imagn Images)

Second-seeded Alexander Zverev of Germany maintained his composure to nab a three-set win to keep up his perfect record in opening round matches at the Mutua Madrid Open by taking down Argentina's Mariano Navone 6-1, 3-6, 6-3 on Saturday.

The two-time Madrid Open winner improved to 9-0 in his first match at the tournament after receiving a first round bye. Zverev converted 4 of 8 break point attempts and had 22 winners to Navone's six.

'It's definitely a different type of tournament here,' Zverev said when asked about the high-altitude conditions. 'I love it. You either love it or hate it, kind of, because there is no in between. Everything is a bit faster, the ball bounces higher, the serve is maybe a bit more effective. So you either love it or hate it. Winning the tournament twice here, of course I hope to add some more titles to that. I enjoy playing here.'

With the win, Zverev has a date in the round of 32 with France's Terence Atmane, who beat his fellow countrymen Ugo Humbert, the No. 30 seed, 7-6 (3), 7-6 (5) earlier in the day.

Also advancing was defending champion and No. 12 seed Casper Ruud of Norway with his 6-0, 6-1 win over Spaniard Jaume Munar. Rudd maintained his serve without being broken and forced Munar into 17 unforced errors.

No. 3 seed and 2024 finalist Felix Auger-Aliassime of Canada advanced past Lithuanian qualifier Vilius Gaubas 6-3, 6-4. Auger-Aliassime never faced a break point behind his dominant serve that yielded seven aces.

Facing off against Auger-Aliassime will be Belgium's Alexander Blockx, who upset American and No. 28 Brandon Nakashima 3-6, 6-3, 6-4. The other big upset of the day was Paraguay's Adolfo Daniel Vallejo beating 17-seed Learner Tien 6-4, 6-3. This was Daniel Vallejo's first ever win over a top 75 opponent.

Vallejo will take on No. 10 Flavio Cobolli of Italy. He beat Argentinian Camilo Ugo Carabelli 6-7 (7), 6-1, 6-4.

In the other three-set match, seventh-seeded Daniil Medvedev held strong against Hungary's Fabian Marozsan 6-2, 6-7 (3), 6-4.

In two-set action on the day, No. 13 Karen Khachanov of Russia took down Australia's Adam Walton 6-2, 6-3; No. 16 Francisco Cerundolo of Argentina outdueled German Yannick Hanfmann 6-1, 7-5; No. 18 Luciano Darderi of Italy bested Argentina's Juan Manuel Cerundolo 6-1, 6-3; Spain's No. 20-seed Alejandro Davidovich Fokina beat fellow countrymen Pablo Carreno Busta 6-3, 6-3 and No. 23 Jakub Mensik of Czechia got past qualifier Martin Damm 6-3, 6-4.

Spanish qualifier Daniel Merida upset No. 26 Corentin Moutet of France 6-3, 6-4; Norwegian qualifier Nicolai Budkov Kjaer dominated No. 31 Canadian Denis Shapovalov 6-2, 6-1 and Greece's Stefanos Tsitsipas got the best of No. 8 Alexander Bublik of Kazakhstan 6-2, 7-5.

--Field Level Media