FORMULA 1: Sebastian Vettel is "worn out" after winning four consecutive world drivers' titles to enable Red Bull to reign supreme in Formula One, according to his team chief Christian Horner.
Horner said that exhaustion was a part of the explanation for the 27-year-old German's loss of form in a season dominated by Mercedes and in which his new Red Bull team-mate Australian Daniel Ricciardo has out-performed him.
The rest, he said, was down to the sport's radical new package of regulations this year which included a return of turbocharged engines and electronic braking systems.
Ricciardo, 25, has won twice to climb to third with 131points after 11 of the year's 19 races, trailing only the Mercedes duo Nico Rosberg of Germany (202) and Briton Lewis Hamilton (191). Vettel, without a win, is sixth on 88.
Ricciardo has out-performed his team mate 6-5 in qualifying and 9-2 in race results.
"It is a combination of several things," said Horner. "First, when you have fought for the title for five years, it does wear you out a little bit, but that is not the fundamental problem.
"The way Sebastian brought out those extra tenths from the car in recent years was quite unique."
Venus set for battle
TENNIS: The last time Venus Williams won the US Open the top three seeds were Martina Hingis, Lindsay Davenport and Jennifer Capriati.
It was 2001 and Venus completed the Wimbledon and US Open double for the second successive year.
Thirteen years on and it is remarkable enough that the 34-year-old will be in the field at Flushing Meadows given her health problems.
This season she has already played 11 tournaments and the tiredness that eventually caught up with her recently in the Montreal final is of a different kind.
She was well beaten by Agnieszka Radwanska in the final but nothing could take away from Venus' stand-out week and the joy she felt in being a contender once again.
"What I enjoyed the most was just being able to compete, being able to push myself, being able to have the opportunity to really bring everything I had," said Venus.
"I just think this week I was tired because I played so many matches. That's great for me.
"Instead of unreasonable fatigue that's unconquerable, just the opposite really: a fatigue from too much success. I ran out of energy because I was winning too many matches."