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Jannik Sinner began his campaign for a record-setting fifth straight Masters 1000 title at the Mutua Madrid Open on Friday, overcoming a stern test from Benjamin Bonzi to advance, 6-7 (6), 6-1, 6-4.

“I struggled quite a lot here, but I knew this before the match that these are very unique courts and conditions,” Sinner said on court after the match. “But I believe every day is different and can make a big difference. I know this, so I can improve slightly for the next round. I tried to stay calm mentally, and that’s why I won today. Tennis-wise, we’ll try to improve. I have one day off, so I’ll use it in a positive way, and we’ll see how far I can go.”

Sinner has now won 18 straight matches—23 in a row on the Masters 1000 level dating back to the Rolex Paris Masters last fall—and is poised to compete the remainder of the clay-court swing without chief rival Carlos Alcaraz, who announced plans to withdraw from the Internazionali BNL d’Italia and Roland Garros due to a wrist injury.

“At the moment, I’m trying to figure out how to play here on this surface,” Sinner said of the possible “Djokemon.”

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Jannik Sinner won't relax after return to world No. 1: "There are important matches coming up"

“We go day by day and we see how it goes. It’s, of course, I know what’s on the line, but at the same time, I don’t focus on this. We know what we have to do. We try to go as far as we can but at the same time, I look at my body and see how it feels. Then, we see what’s coming.”

Up against an in-form French qualifier, Sinner navigated a close deciding set before ultimately serving out the win in two hours and 20 minutes on Manolo Santana Stadium.

Sinner has won every Grand Slam and Masters 1000 title except Madrid, Rome and Roland Garros, and Alcaraz’s absence opens the door for the Italian to become the first since Novak Djokovic to win all 13.

But first Sinner had to get past Bonzi, a 29-year-old who won three matches in Madrid’s unique conditions to book a meeting with the world No. 1. Playing his first match since winning the Rolex Monte-Carlo Masters, Sinner had a set point in the first-set tiebreaker but found himself behind after Bonzi reeled off three straight points of the Sudden Death.

Sinner roared back in the second and claimed a crucial break early in the third, ultimately serving out the match on his first opportunity.

Up next for the Italian will be Denmark’s Elmer Moller, a strong clay-courter looking to make his Top 100 debut in 2026.