According to a People report, "just getting started" echoed Williams' comments in her post-match interview yesterday after German player Angelique Kerber defeated Williams and took home her first ever Wimbledon title, which was Germany's first since Steffi Graff won in 1996.
However, Kerber's vintage defensive skills enabled the German to neutralise her opponent's enormous power and earned the 11th seed a 6-3 6-3 victory on Centre Court for her first Wimbledon crown.
Serena lost to Angelique Kerber in the Wimbledon final on Saturday, but said it was just the start of her comeback.
The 36-year-old American Williams, who was chasing a record-equalling 24th major title, was broken three times in the opening exchanges as she dropped the first set in half an hour. "I was really happy to get this far", Williams said.
She had some words for all of her fellow mothers: "To all the moms out there, I was playing out there for you today and I tried".
In a role reversal from her wedding - at which Williams was a guest in May - Markle is watching her friend from the royal box. Fissette has no doubt there are more titles to come.
Seeded 11th, Kerber played a remarkable, purposeful final - absorbing pace as she does as well as anyone in tennis but also being bold when she needed it.
Williams had fought back from a set down in the quarter-finals against Camila Giorgi, but the fighting spirit was clearly spent this time.
"To share with her a court, it's always an honor for me because I know she's pushing me to the limits I have to play my best tennis".
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Williams struck the ball into the net during the final point, and Kerber fell on the grass court in a show of victory.
She said: "I literally sat Olympia in my arms, I talked to her, we prayed about it".
Following the match over the weekend, Williams told the crowd that while it was disappointing to lose, she knows she can't be disappointed. And I'm sure you will have your next Grand Slam title soon.
Williams had dominated the 2016 final between the pair but this time her 30-year-old rival returned and reversed the result from two years ago to win in 65 minutes with determined shot-making.
Kerber took the decision to replace her long-time coach Torben Beltz with Wim Fissette.
Catherine, a patron of Wimbledon, is still officially on maternity leave but has made a few public appearances, including her youngest son Louis' christening, and the Queen's birthday celebrations at Trooping the Colour.
Nadal, who won the French Open for the 11th time last month, spent much of 2016 out of action with a wrist injury.