(Reuters) -Nineteen-year-old Czech Jakub Mensik beat his childhood idol Novak Djokovic 7-6(4) 7-6(4) in an upset for the ages on Sunday, claiming his first ATP title at the Miami Open as he denied the former number one his bid for a milestone 100th.

Jakub Mensik used his length to shrink the court, erasing Novak Djokovic's ability to find winners in a shock upset for his first career tennis title Sunday at the Miami Open. The No. 54 player in the world also denied Djokovic of his 100th career title and a record seventh Miami Open crown.

The start of the Miami Open men's final between Novak Djokovic and unseeded 19-year-old Jakub Mensuk on Sunday at Hard Rock Stadium was delayed 5½ hours from its 3 p.m. start time.

Aryna Sabalenka of Belarus earned her first Miami Open championship by defeating American and No. 4 Jessica Pegula 7-5, 6-2 to become the sixth player to win Miami as the reigning No. 1. Former great Serena Williams did it four times.

Top-seeded Aryna Sabalenka recorded 31 winners while sailing to a 7-5, 6-2 victory over fourth-seeded Jessica Pegula on Saturday to win the Miami Open for the first time in her career. Sabalenka, ranked No.

Sabalenka now lives in Miami but Pegula had the crowd support. Pegula, a 31-year-old Buffalo native, has lived in Boca Raton since she was 13 and is daughter of Terry Pegula, owne