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Ever struggled to get through work without a coffee? Then you’ll understand why Serena Williams ordered an espresso halfway through a match on Monday night.

Williams said she struggling in her game against Italy’s Flavia Pennetta in Perth’s Hopman Cup, with jet lag taking its toll.

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“I am a coffee drinker and I didn’t have mine this morning and I was just feeling it, so I had to get some coffee in me,” Williams said after winning the game.

“I just asked them to get me a shot of espresso. I asked them if it was legal, because I’ve never done it before.”

“But I needed to wake up – it’s just the jetlag. It gets you all the time.”

The world number one went down in the first set in 19 minutes, but made a complete turnaround after the caffeine fix, winning the match in three sets, 0-6 6-3 6-0.

Penetta vs Serena “Coffee” Williams 0-6, 6-3, 6-0 #HopmanCup pic.twitter.com/PgF71PtNxG

— Gaston Taborda (@gazti10) January 5, 2015