Croatians Mate Pavic and Nikola Mektic defeat countrymen Marin Cilic and Ivan Dodig on Friday to win the gold medal in Tokyo.

Nikola Mektic (right) and Mate Pavic became the first all-Croatian team to win the Wimbledon doubles trophy on Saturday.

Nikola Mektic and Mate Pavic defeat Rajeev Ram and Joe Salisbury on Thursday to reach their first Wimbledon final.

Nikola Mektic and Mate Pavic celebrate winning the Rome doubles title on Sunday over Rajeev Ram and Joe Salisbury.

Nikola Mektic and Mate Pavic captured their third ATP Masters 1000 trophy of 2021 in Rome on Sunday.

Mate Pavic (left) and Nikola Mektic (right) celebrate winning the Monte-Carlo doubles title on Sunday.

Mate Pavic (left) and Nikola Mektic (right) celebrate capturing the Monte-Carlo doubles title on Sunday.

Mate Pavic (left) volleys during the Monte-Carlo final, which he won with Nikola Mektic on Sunday.

Nikola Mektic and Mate Pavic took a 3-0 lead in the first set of the Monte-Carlo doubles final against Daniel Evans and Neal Skupski on Sunday.

Mate Pavic (left) and Nikola Mektic (right) reach the Monte-Carlo doubles final on Saturday.

Nikola Mektic and Mate Pavic beat Daniel Evans and Neal Skupski to triumph in Miami for their fourth title of the season.

Mate Pavic and Nikola Mektic break serve three times against Daniel Evans and Neal Skupski on Saturday to win the Miami title.

Nikola Mektic (right) and Mate Pavic (left) own a 22-3 record this year.

Second seeds Nikola Mektic (left) and Mate Pavic (right) book their places in the Dubai semi-finals on Thursday.

Nikola Mektic (right) and Mate Pavic (left) capture their third title of 2021 on Sunday at the ABN AMRO World Tennis Tournament.

Nikola Mektic (right) and Mate Pavic (left) have reached the semi-finals or better at all four events they have played in 2021.

Mate Pavic (left) and Nikola Mektic (right) win their 14th match in 2021 on Friday for a place in the Rotterdam semi-finals.

Second seeds Mate Pavic and Nikola Mektic improve to 13-1 on the season after beating Robin Haase and Matwe Middelkoop on Tuesday in Rotterdam.

Second seeds Mate Pavic (volleying) and Nikola Mektic extend their winning streak on Wednesday at the Australian Open.

Nikola Mektic (right) and Mate Pavic (left) survived three Match Tie-breaks en route to the Murray River Open title.

Nikola Mektic and Mate Pavic are unbeaten in eight matches as a team.

Mate Pavic and Nikola Mektic celebrate capturing the Antalya Open doubles title on Tuesday.

Nikola Mektic and Mate Pavic advance to the Antalya doubles final on Monday.

Nikola Mektic and Mate Pavic won their first match of the season in Antalya on Friday in a Match Tie-break.

Mate Pavic (right) and Bruno Soares (left) are aiming to finish the 2020 ATP Tour season as the No. 1 team in the FedEx ATP Doubles Team Rankings.