"There is still a lot to do," said Mayer, after posting an eighth consecutive win for his country. "And we will do it little by little."
Belgium 1-1 with Argentina in Davis Cup semifinals →
"As long as my body holds up and I can keep staying fit, I'll do it as long as I can," he said.
At Citi Open, Haas ready to show that tennis isn't just a young man's game →