RIO DE JANEIRO, Brazil – Kirsten Flipkens saved her best tennis for the end of the day, taking out four-time Olympic gold medalist Venus Williams in a three hour marathon, 4-6, 6-3, 7-6(5) to close out the opening day of the Olympic tennis event in Rio.

“My dream was to come to Rio, but to beat one of the greatest champions, that’s a second dream coming true,” Flipkens said after the match.

The unseeded Belgian, a first-time Olympian, split sets with Williams as the American took the opening set by imposing her powerful baseline game, but Flipkens battled back aggressive on the return and broke Williams’ serve four times to take the second.

In the deciding set, Flipkens surrendered the first break in the fourth game as Williams built up a 4-2 lead. But just as Williams was serving for the match at 5-3, weariness began to take its toll as the match neared the three-hour mark. Flipkens fought back and the match went to a tiebreak, where Williams’ errors at the net ended up costing her the match.

“I was already thinking in the third set that it was one of the most epic matches I’ve ever played,” Flipkens said. “I said to myself before the match that I would just enjoy the match and give 200% on each point.”

“I felt like I could win the match but at the same time I was enjoying it so much it was hard to keep focused. You’re playing Venus Williams, not some junior.”

Earlier in the day, another American was knocked out of the competition as Eugenie Bouchard defeated Sloane Stephens 6-3, 6-3.

“I felt good out there, I was just trying to be very solid and I think I did that well,” Bouchard said. “I don’t think I gave her too many chances. I was there on every one of the return games. I was pushing her and I was close to breaking her a couple of times, so I am happy mentally. I was very focused.”

Bouchard grabbed the decisive break early on in both sets, and backed them up with aggressive play to book her spot in round two after an hour and fifteen minutes.