Serena Williams lifts the Billie Jean King trophy – WTA Finals in pictures

Serena Williams prepares to return a shot to Simona Halep during her victory in the WTA Finals title match on Sunday. Julian Finney / Getty Images

Simona Halep plays a backhand against Serena Williams in the WTA Finals title match on Sunday in Singapore. Clive Brunskill / Getty Images

Serena Williams of readies to play a shot against Simona Halep in the WTA Finals title match in Singapore on Sunday. Julian Finney / Getty Images

Simona Halep attempts a return to Serena Williams in her loss on Sunday in the WTA Finals title match. Julian Finney / Getty Images

Serena Williams prepares a shot against Simona Halep in the WTA Finals title match on Sunday. Julian Finney / Getty Images

Serena Williams reacts during her win in the WTA Finals match on Sunday in Singapore. Mark Baker / AP

Serena Williams acknowledges the crowd after beating Simona Halep in the WTA Finals title match on Sunday. Julian Finney / Getty Images

Serena Williams holds aloft the Billie Jean King trophy after winning the title at the WTA Finals on Sunday in Singapore. Clive Brunskill / Getty Images

Serena Williams holds up the Billie Jean King trophy after emerging victorious in the title match against Simona Halep at the WTA Finals on Sunday. Mark Baker / AP

Images from Sunday’s WTA Finals title match in Singapore, where Serena Williams bested Simona Halep for her third straight victory at the elite season-ending tournament.