The 23-time Grand Slam champion dropped her first set of the championships but came through 3-6 6-3 6-4.
Williams dug deep to deny Camila Giorgi a famous victory with a fighting 3-6 6-3 6-4 quarterfinal comeback win over unseeded Italian on Tuesday (Wednesday NZ Time).
Her star power grew during a match against Serena Williams in the quarterfinals when she won the opening set and challenged in the third.
The 36-year-old will play German 13th seed Julia Goerges on Thursday for a place in Saturday's final boasting a 3-0 career record.
The tall Czech answered an early break with one of her own but 20th seed Bertens secured a second break with a superb touch volley to move 5-3 ahead and then held easily.
World No 52 Giorgi blasted 20 winners and really took it to Williams, taking the first set thanks to one break, in the sixth game.Читайте также: ANP leader among three others killed in Peshawar blast
Williams will next face Italy's Camila Giorgi, who beat American Madison Brengle 6-4, 6-4.
"It's pretty unreal for me", said Goerges, who reached her first major semifinal at a tournament where she exited in the first round each of the past five years.
Federer needed just 16 minutes to win the first set and the Swiss never looked back.
Rebounding from her shock first-round elimination in her Roland Garros title defence, Ostapenko has marched through the Wimbledon draw without dropping a set.
Kerber took advantage of Kasatkina's erratic serving and errors to return to the last four.
After a series of upsets made this edition of Wimbledon the first since it began seeding players in the 1920s that none of the top 10 women reached the quarterfinals, Nos.При любом использовании материалов сайта и дочерних проектов, гиперссылка на обязательна.
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