NEW YORK: Australia’s Ajla Tomljanovic followed up her victory over Serena Williams with another battling performance to beat Liudmila Samsonova and reach the quarter-finals of the US Open on Sunday.

Tomljanovic – who knocked out tennis icon Williams in the third round on Friday – advanced to the last eight with a 7-6 (10/8), 6-1 victory over Samsonova.

The 29-year-old world number 46 will play either Tunisia’s Ons Jabeur or Russia’s Veronika Kudermetova in the quarters.

“The fact that I won, I’m still a little speechless,” Tomljanovic said after her win.

Tomljanovic was set on the path to victory after a dramatic opening set which lasted 1hr 22mins. She saved seven set points in an epic near 20-minute 10th game to hold serve at 4-5 down.

She then saved another in the tie-break before clinching the set.

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“I don’t know that it’s 20 minutes … If I knew it was that long I would probably panic a little bit,” Tomljanovic said of the marathon 10th game.

“I think it was just about staying in the moment. I just try to stay as calm as possible because inside I’m dying.”

After the marathon the first set, the second set was one more-sided with Tomljanovic wasting no time in wrapping up the victory.