Defending champion Carlos Alcaraz[1] defeated Jan-Lennard Struff in the final, 6–4, 3–6, 6–3 to win the men's singles tennis title at the 2023 Madrid Open. It was his fourth Masters 1000 title. Struff was the first lucky loser to reach a Masters final.[2]
This was the first edition in the tournament's 21-year history to not feature Roger Federer, Rafael Nadal, or Novak Djokovic (collectively known as the Big Three) in the main draw. They won 11 of the preceding 20 editions of the Madrid Open, reaching 13 finals in total.[3]
Zhang Zhizhen became the first Chinese tennis player to reach the singles quarterfinals of an ATP Masters 1000 event.[4]Aslan Karatsev became only the second qualifier to reach the Madrid Open semifinals, after Fabrice Santoro in 2002.[5] The semifinal encounter between Karatsev and Struff was a rematch of their meeting in the qualifying rounds of the tournament, which Karatsev had won; Struff, who advanced to the main draw as a lucky loser after withdrawals, won their semifinal rematch.
The following are the seeded players. Seedings are based on ATP rankings as of April 24, 2023. Rankings and points before are as of April 24, 2023.
Because the men's tournament is being expanded to two weeks this year, players are defending points from the 2022 Madrid Open, as well as tournaments that took place during the week of April 25, 2022 (Estoril and Munich). Points from the 2022 Madrid Open are listed first in the "Points defending" column.
† The player did not qualify for the main draw in 2022, but is defending points from Estoril, Munich, or Mauthausen (ATP Challenger).
‡ The player did not qualify for the main draw in 2022. Points for his 19th best result will be deducted instead.
§ The player entered an ATP Challenger Tour event in the second week of the Madrid tournament and points from that second tournament replaced his 19th (or 18th) best result.
Withdrawn players
The following players would have been seeded, but withdrew before the tournament began.