Serena Williams: Mid-match espresso gets Serena's shots going

World number one Serena Williams calls for an espresso during a change of ends at 5-0 down in her Hopman Cup match against Flavia Pennetta.

The double shot did the trick as Williams turned the game round to win 0-6 6-3 6-0 and helped the USA to a 3-0 win over Italy.

Later this month Williams will look to win her first Australian Open title since 2010 and her 19th Grand Slam singles crown.