Yet , Serena remained in a state of focus and professionalism .
The crowd booed and shouted racial insults at Serena and Richard Williams when they returned to the stadium to play the match against Kim Clijsters .
Serena remained in a state of focus and professionalism .
The crowd booed and shouted racial insults at Serena and Richard Williams when they returned to the stadium to play the match against Kim Clijsters .