Roger Federer overcame a shaky start to emphatically see off Tomas Berdych in the ATP World Tour Finals in London on Sunday.
The legendary Swiss was guilty of some uncharacteristic errors at the start of the first set at the O2 Arena, but then turned on the style to win his Group Stan Smith opener 6-4 6-2.
Federer, a six-time winner of the glitzy season-ending tournament, played with a swagger in the second set and Berdych was unable to live with him.
It had all started so promisingly for sixth seed Berdych when two Federer double-faults and a stray backhand from the 17-time grand-slam champion put the Czech 2-0 up.
But Federer regained his composure and broke straight back to love when Czech made a mistake at the net and the third seed found himself a set up after Berdych sent a forehand long.
Federer raised his game in the second set, putting on a show for an expectant crowd as he broke immediately and then came up with a sumptuous forehand winner at the start of the next game en route to holding to love.
The 34-year-old produced an array of sublime winners - including a deft backhand drop shot - as he raced into a 4-0 lead and sealed victory in just 69 minutes.
Federer joins top seed Novak Djokovic at the top of the group after the world number one outclassed Kei Nishikori in the first game of the tournament earlier in the day.
Federer  bt Berdych  6-4 6-2
Federer - 4
Berdych - 4
BREAK POINTS WON
Federer - 4/6
Berdych - 1/1
FIRST SERVE PERCENTAGE
Federer - 61
Berdych - 44
PERCENTAGE OF POINTS WON ON FIRST/SECOND SERVE
Federer - 86/50
Berdych - 70/38
Federer - 58
Berdych - 40