Sania and Martina, the top seeds, prevailed 6-0 6-3 over their eight-seeded rivals in a lopsided summit clash, which lasted little over an hour.
Before this, Sania and Martina had won eight titles (Indian Wells, Miami, Charleston, Wimbledon, US Open, Guangzhou, Wuhan and Beijing) and finished runner-up just once (Rome - falling to WTA Rising Stars Timea Babos and Kristina Mladenovic).
Sania and Martina are now unbeaten in 22 matches, stretching back six tournaments. In fact, since their last defeat -- to Chan Hao-Ching and Chan Yung-Jan in Cincinnati -- they have dropped just two sets.
Muguruza and Suarez Navarro -- late replacements in the draw after Casey Dellacqua and Yaroslava Shvedova's withdrawal -- were completely outplayed in the match.
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In the second game, Sania unleashed a ferocious forehand to break Muguruza.
The second set was more competitive, but Sania and Martina did not let go of their supremacy and wrapped up after little over an hour on court.
This triumph is especially huge for Martina as the trophy was her 50th WTA doubles title, a milestone only 15 players have reached (Martina Navratilova, Rosie Casals, Pam Shriver, Billie Jean King, Natasha Zvereva, Lisa Raymond, Jana Novotna, Arantxa Sanchez-Vicario, Gigi Fernandez, Helena Sukova, Larisa Neiland, Cara Black, Rennae Stubbs, Wendy Turnbull and Liezel Huber).