SAN ANTONIO, TX, USA - A shock win for Viktorija Golubic began the day, but Sloane Stephens restored order to end it.

The United States and Switzerland are level at 1-1 after the first day of play in their World Group Play-off tie in Texas.

World No.80 Golubic delivered a stunning upset of Madison Keys to start the afternoon, 6-2, 6-3, but Stephens rebounded to win the second singles rubber, rallying from a break down in each set to defeat Timea Bacsinszky, 6-4, 6-3.

Golubic never trailed against the former US Open finalist, setting the tone after breaking in the first game of the match and again in the seventh en route to serving out the set.

The Swiss' one-handed backhand and increased variety drew Keys into a host of unforced errors for the match, as the American racked up 47 in 17 games.

"I think I can beat her anywhere," Golubic told reporters after the match, as reported by

"But obviously, I mean, this is a different event. You cannot compare it to anything else. We just have a really great team. I think this also gives me lot of boost during the match.

“Every break is, like, a big thing. Because it happened at the beginning, I was kind of always leading in the first set which was somehow a little easier."

However, Stephens pulled the hosts level with a come-from-behind win in the second rubber, where she rallied from 3-1 down in the first set and 2-0 down in the second set to seal a second career victory over Bacsinszky, in their first meeting in six years. 

"Obviously everyone knows we're playing for more than ourselves, we're playing for our country," Stephens told reporters after the match, as reported by

"You have to dig, find the energy, muster it up, fight as much as you can, make sure you get those games. I just wanted to go out and get the point for our team."