Iga Swiatek thrashed Jessica Pegula to win the season-ending WTA Finals and move back to the top of the women's rankings.
The Pole needed to beat the American in the final in Cancun to overtake Aryna Sabalenka as world number one and she did so with a dominant 6-1 6-0 win.
The 22-year-old was in clinical mood as Pegula struggled to find her range in a match lasting just 59 minutes.
It is the first time Swiatek has won the WTA Finals tournament.
The final took place a day late on Monday following bad weather at the event but was played out in sunshine at the venue in Mexico.