Marcos Giron is an American professional tennis player born on July 24, 1993, in Thousand Oaks, California. He gained prominence during his collegiate career at UCLA, where he won the 2014 NCAA ...

In their Davis Cup debuts, Marcos Giron and Alex Michelsen each scored straight-sets singles wins to lift the USA to a 2-0 lead over Chinese Taipei. Photo credit: Atsushi Tomura/Getty for ITF. U.S.

Defending champion Jannik Sinner has defeated 46th-ranked Marcos Giron of the U.S. 6-3, 6-4, 6-2 at the Australian Open Credit: AP Credit: AP MELBOURNE, Australia (AP) — Defending champion ...