Triumphant in her two previous Wimbledon tilts in 2015 and 2016, Williams's victory also extended her winning streak on the London grass to 19 matches.
"I think it's everything worth it for the season I'm playing now, that I'm sitting here right now, I'm able to play on Thursday semi-final against Serena Williams".
Williams, who gave birth to her first baby in September, is now ranked No. 183 and has won seven Wimbledon singles titles.
"I'm ok, I feel good, I feel like I did better today, I had to".
The fifth-seeded del Potro failed to convert four match points when serving at 5-4 in the fourth set, but maintained his composure to close out the contest with his first opportunity in the tiebreaker that followed. Even when I was down in the first set, I thought, "Well, she's playing great, [but] I'm doing a lot of the right things". I had to have multiple surgeries and nearly didn't make it to be honest. I just felt calm.
"This is not inevitable for me".
The American star will have history in her sights against Kerber as she tries to equal Margaret Court's record of 24 Grand Slams singles titles. Especially at Wimbledon, where she is one victory away from an eighth championship.
It was Kerber's turn to falter on serve in the next game and Kasatkina let out a huge roar as she secured her first break of the afternoon to reduce the deficit to 4-3.
"It's still one more match to go for both of us".
Having crashed out in the first round at Wimbledon for five consecutive times, Goerges' emotions spilled over at the end of the match after she embraced Bertens at the net.
However, each of the top 10 seeds in the women's bracket were eliminated by the fourth round.
Kasatkina, 21, was making the first Grand Slam semi-final of her promising young career and she pushed Kerber hard in the closing stages before the German finally delivered the knockout blow. Sometimes I feel I can fight.
The second set shaped the same way.
Jelena Ostapenko became the first Latvian to reach the Wimbledon singles semifinals after she subdued Slovakia's Dominika Cibulkova 7-5, 6-4 on Tuesday. While the German hit less than half the number of winners that the Russian hit (16), she also made less than half the number of unforced errors (14). "So I just started to play better".
It's nearly as if Serena Williams never left.
"It was nearly three years ago when I chose to make a change in my team", Goerges said when explaining her resurgence.
'We never played, she [Kerber] is one of the players I've never played. "Everybody has the same chances to win that match, and I'm looking forward to it".
Kerber is a former No. 1 who owns two Grand Slam titles and was the runner-up to Williams at Wimbledon two years ago.