Elsewhere, it was a disappointing day for the remaining British interest.
Here, PA reviews the best of the day's action.
Tweet of the day
Quote of the day
Picture of the day
Shot of the day
Williams was giving Halep the runaround and raced to the net as a point looked won, but the Romanian somehow produced a cross-court backhand winner at full stretch, leaving her opponent applauding the shot.
Stat of the day
The new champion admitted that she had never played a better match. Handy timing.
On yer head son
Frenchman Nicolas Mahut got more than he bargained for when he tried to defend a smash on the baseline and a 120mph overhead from Robert Farah left him floored when it reared up off the grass. It hit him above his left eye, which left him with an egg-shaped bruise on his forehead and required concussion checks from the doctor during a medical timeout.
Halep gets her wish
When the seventh seed was asked who she would like to be watching her in the Royal Box at the final, she replied "Kate. I like her." Well the Romanian got her wish as the Duchess of Cambridge attended the All England Club for the second time this fortnight, having also spent day two here.
Andy Lapthorne was handed a beating by his doubles partner Dylan Alcott in the quad wheelchair singles final as he lost 6-0 6-1. There was also a defeat in the wheelchair doubles final for Alfie Hewett and Gordon Reid while Arthur Fery and Toby Samuel fell short of making the boys' doubles final with a semi-final loss.
Day 13 order of play
Roger Federer v Novak Djokovic