It was Serena's 100th career main draw victory on grass. After losing the first set Aliaksandra Sasnovich failed to show the same level of game. My coach wants me to go for the shots.
With Ostapenko and her compatriot Ernests Gulbis both making the second week at Wimbledon this fortnight, it's the first time in history that multiple Latvian players have made it this far at the same Grand Slam.
Williams won Wimbledon on her last two visits in 2015 and 2016 before missing last year's event due to her pregnancy.
That tunnel vision allowed the 30-year-old to become the only woman to reach at least the quarter-finals in all three of this year's majors.
"This is not the first time this can happen, because sometimes you have two bounce and the chair umpire they don't see it".
Ostapenko claimed her first win over Dominika Cibulkova to book her spot in a first semi-final at the All England Cub without dropping a set.
This is only her fourth tournament since giving birth to daughter Olympia in September 2017, and the 23-time Grand Slam victor pointed out how motherhood had changed her approach to tennis.
"I think everything right now is a little bit of a surprise", she said. "I was just trying to enjoy it because its really great to be here in the second week and now I'm in the semis and really happy with the way I played".
Neither Kerber nor Williams, who were seeded 11th and 25th respectively for this year's tournament, were odds-on favorites to reach the final.
Given the opportunity to criticise Cibulkova for protesting about the replay, Hsieh took the high road.
"I'm here just to prove I'm back, and I feel like I'm back".
It was to get no better for the world number 50, another quick hold from the 12th seed made it five games on the trot and the Belarusian was quickly staring at the end of her fortnight.
The 12th seed, who hasn't dropped a set in her first five matches, battled past Slovakian world number 33 Cibulkova on Court One.
Cibulkova did just that, regaining her composure to break and take the first set, before comfortably closing out victory in the second. On one particularly insane 40-all volley, the two volleyed 25 times before Kerber got it to match point - which Kasatkina quickly reset to 40-all. "It was too hard so I had to ice it", she added.In another match of the day, Juan Martin del Potro set up a Wimbledon quarter-final clash against Rafael Nadal when he downed Gilles Simon of France 7-6 (7/1), 7-6 (7/5), 5-7, 7-6 (7/5).
Del Potro looked flat as he was broken to trail 3-1 but he clawed his way back to lead 5-4 with his serve to come. So I think it's a great week. But unlike in the quarterfinals, when she needed seven match points to win, this time it required only two, with the match ending - fittingly enough - on a forehand by Ostapenko that sailed wide.
The blustery conditions that had initially troubled Novak Djokovic and Karen Khachanov on the same court late last night had returned and both women lost their opening service game.
1st LD: Trump starts United Kingdom visit amid protests
A giant six-metre-high blimp of Trump depicted as an orange baby in nappies is also expected to fly over the capital. Asked in Brussels about the massive demonstrations expected at the next stop of his European trip, Mr.