Adrenaline key for Serena's super Saturday Wimbledon

Serena Williams was able to rely on adrenaline from her Wimbledon singles title win to help her claim the ladies doubles championship with sister Venus on Saturday.

The American equalled Steffi Graf's record of 22 grand slam crown with a straight-sets win over Angelique Kerber at the All England Club, but had little time to celebrate before another final.

While the exertions of a major final can take it out of some players, Serena insisted she was able to get through and win her second trophy of the day thanks to the adrenaline boost from becoming a seven-time Wimbledon singles champion.

"When you win the singles, there's so much adrenaline," she said after the 6-3 6-4 win in tandem with her older sibling over Timea Babos and Yaroslava Shvedova.

"You have an opportunity to play the finals of doubles, you want to stay out there.

"It's unbelievable. It's a feat even I couldn't have thought would have happened. It's amazing."

Saturday's win was a sixth ladies doubles title at Wimbledon for the Williams sisters and Venus hopes it bodes well for their upcoming attempt to win gold at Rio 2016.

"Well, we needed to play some matches before the Olympics. We haven't played in ages," said Venus, who was beaten by Kerber in the singles semis.

"So we started playing in Rome. Played the French. If we get lucky, we'll get a chance to play in the summer before Rio.

"Hopefully this puts us in a good position, because more than anything we want to represent the US the best we can. We don't want to come in rusty."

The Williams sisters have won women's doubles gold at the last three Olympics, beating Czech Republic duo Andrea Hlavackova and Lucie Hradecka in London four years ago.