Siniakova and regular partner Krejcikova notched a 6-1, 6-4 victory over the wild-card pairing of Danielle Collins and CoCo Vandeweghe.
No.1 seeds Krejcikova and Siniakova have won 16 doubles titles as a team, including seven Grand Slams. They had not taken home a championship trophy since they won Indian Wells in March, but this week, the Czechs triumphed after a 66-minute final.