A person's anaerobic threshold has been reached when their body is under extreme conditions and the burning of oxygen can not keep up with the body's demands.
Novak Djokovic captured his second straight Wimbledon title and the third of his career by defeating Roger Federer 7-6, 6-7, 6-4, 6-3 in Sunday's men's final at the All England Club. Djokovic is the first man to repeat as Wimbledon champion since Federer won five in a row between 2003 and 2007.
Sunday's men's final sees world No. 2 Roger Federer, aged 33 like Williams, battle top-ranked Novak Djokovic in a repeat of the 2014 finale the Serb won in five sets. But the final Saturday at Wimbledon, just like the final weekends in New York, Melbourne and Paris in the last 11 months, belonged to Williams.