Nick Kyrgios barely broke a sweat on his way to a 6-3 6-2 win against Marcos Giron in the opening round of the Washington Open, finishing the job in an even 60 minutes.

The talented Australian, who won the doubles title at last week's Atlanta Open with compatriot Thanasi Kokkinakis, showed off his imposing serve against Giron. He won the ace count 12-to-four, while converting 82 per cent (28-of-34) of his successful first serves into points.

Earlier in the day, Daniel Evans won an all-English showdown against Kyle Edmund 6-1 6-2, but fellow Englishman Jack Draper was not so lucky against Russia's Andrey Rublev, going down 6-4 6-2.

Winner of the singles title at the Atlanta Open, Jenson Brooksby could not keep his strong form going as he lost 6-4 6-3 to Yoshihito Nishioka. Mackenzie McDonald lost to Brooksby in Atlanta, and he was also bounced in the first round by Finland's Emil Ruusuvuori 1-6 6-4 6-4.

America's Chris Eubanks won a tough three-setter against France's Benjamin Bonzi 3-6 6-3 7-5, and Sebastian Korda passed the test of in-form Ilya Ivashka 6-4 7-6 (7-5).

Veteran Jack Sock got the better of Belgium's David Goffin 7-6 (7-4) 6-4, and the Netherlands' Botic van de Zandschulp fought off frisky Croatian Borna Gojo 7-6 (8-6) 6-7 (5-7) 6-4 to narrowly avoid an upset from a player ranked 170 spots lower.

Meanwhile, at the Los Cabos open in Mexico, Kokkinakis continued his march back up the rankings with a 6-3 6-7 (5-7) 6-2 win against Fernando Verdasco.

Kokkinakis will play American Steve Johnson in the second round after he collected a straight sets 7-6 (7-1) 6-4 win against Argentina's Gonzalo Villanueva.

Romania's Radu Albot defeated Spain's Feliciano Lopez 6-3 6-7 (6-8) 6-3 to book his place in the second round against Australian Jason Kubler, who won his 10th match from his past 12 fixtures to beat Tomas Martin Etcheverry 6-7 (4-7) 6-3 6-1.

The only Mexican in the draw, Alex Hernandez, made the most his wildcard to win his first tour-level match, defeating Nicolas Barrientos 3-6 6-4 6-4 to become the first Mexican player to win at Los Cabos.

Facundo Bagnis was the only of the three Argentines to make it through, with a 6-3 6-1 win over Ernesto Escobado, Brandon Nakashima defeated Kaichi Uchida 7-6 (7-1) 6-2, and Jordan Thompson rounded out the day's action with a comfortable 6-3 6-0 triumph over Yannick Hanfmann.