Fabio Fognini celebrates his first hard-court title on Saturday in Los Cabos.

Mexican Miguel Angel Reyes-Varela, left, and Marcelo Arevalo of El Salvador celebrate their first ATP World Tour doubles title as a team.

Fabio Fognini defends well and beats Juan Martin del Potro for the first time on Saturday in Los Cabos.

Marcelo Arevalo of El Salvador, left, and Mexican Miguel Angel Reyes-Varela celebrate their first ATP World Tour doubles title as a team.

Juan Martin del Potro plays in his fourth final of 2018 on Saturday in Los Cabos.

Fabio Fognini beats Cameron Norrie in straight sets to book his place in the Los Cabos final on Friday.

Juan Martin del Potro defeats Damir Dzumhur to reach the Los Cabos final on Friday.

Juan Martin del Potro was nearly perfect during his quarter-final win on Thursday in Los Cabos.

Argentine Juan Martin del Potro keeps his hopes for a Mexican double alive on Wednesday in Los Cabos.

Sam Querrey will look to win his first title of the 2018 season this week in Los Cabos.

Taylor Fritz will look to bolster his status in the ATP Race To Milan this week in Los Cabos.

Juan Martin del Potro is pursuing his third title of the season, which would be the fifth time he has lifted that many trophies in a year during his career.

Juan Martin del Potro will go for his third title of the season this week in Los Cabos.

Juan Martin del Potro and Fabio Fognini are the first and second seeds, respectively, at the Abierto de Tenis Mifel presentado por Cinemex in Los Cabos, Mexico.

Juan Martin del Potro and Fabio Fognini participate in an exhibition at the Sunset Monalisa ahead of the Abierto de Tenis Mifel presentado por Cinemex.

Juan Martin del Potro, who won the biggest title of his career earlier this season at the BNP Paribas Open, is competing in Los Cabos for the first time.

#NextGenATP American Taylor Fritz will begin the pursuit of his first ATP World Tour title in Los Cabos against his doubles partner, Thanasi Kokkinakis.

Bernard Tomic seeks his first match win in Los Cabos against Egor Gerasimov in the first round. The Aussie also appeared at the event in 2016.

Bernard Tomic and Taylor Fritz enjoy a jet-skiing session on the water in Mexico before beginning their tournaments against Egor Gerasimov and Thanasi Kokkinakis, respectively.

World No. 4 Juan Martin del Potro is the top seed in Los Cabos. He will start his campaign against Marcelo Arevalo or a qualifier.

Defending champion Sam Querrey, the fifth seed, assists at the Los Cabos draw ceremony. He will face Lucas Gomez in the first round.

2017 champion Sam Querrey and runner-up Thanasi Kokkinakis pose with their trophies on Saturday.

Sam Querrey completes the Mexican double in 2017, adding a title in Los Cabos to his Acapulco crown.

Sam Querrey wins his second title of the season in Los Cabos.

Juan Sebastian Cabal (L) wins his third ATP World Tour doubles of 2017, while Treat Huey wins his first.