Six-time champion Serena Williams shook off a sluggish start to power past eighth-seeded Karolina Pliskova 6-4, 6-3 on Tuesday and into the US Open semi-finals. The US superstar, chasing a record-equalling 24th major title, surrendered an early break to Pliskova, but she roared back with a streak of eight straight games to put away the opening set and take a 4-0 lead in the second against the woman who beat her in the semi-finals at Flushing Meadows in 2016.

"I just wanted to play better," Williams said of her mindset as she trailed 3-1 in the first. "I was thinking, you know, I can play better, so that was the good news." Williams did indeed cut down on the errors, and came up with the big serves when she needed them.