Roddick returns for US

Roddick, whose record for America of 31-11 is bettered only by John McEnroe, will join up with the squad in the Chile for a first-round tie on the red clay of Santiago on March 4-6.

It will be Jim Courier's first match in the charge after he took over the captaincy from Patrick McEnroe.

"I'm very excited to be back," Roddick said. "Davis Cup is something you should commit to for the entire season and not when it's convenient.

"Trying to win the Davis Cup again is a top priority for me in the 2011.

"I look forward to working with Jim next season.

"It will be strange to be sitting next to someone other than Patrick on the bench, but I have a great deal of respect for Jim."

Courier added: "Having Andy commit to the 2011 campaign is huge for our team.

"Andy not only brings his outstanding Davis Cup record but also his experience and team leadership, which will be invaluable to our efforts."

Shanghai success for Roddick

American No.1 Roddick was leading 6-3 2-1 when unseeded with German Kohlschreiber, who was clearly out of the sorts, called it a day.

"We've all been on the bad side of having to pull out of a match. It's not fun," Roddick said.

Chinese wildcard Bai Yan delighted home fans by causing the shock of the day to defeat the world number 30 Radek Stepanek.

Bai, ranked 465 in the world, converted all the four break points he earned to send the Czech star packing 6-3 6-4.

"It's my first time in a top level tournament, so it's really an unexpected performance for me," said 21-year-old.

Fellow home-grown wildcard Zhang Ze gave Croatian Ivan Ljubicic a scare before the Croatian veteran restored order with a 5-7 6-3 6-4 win.

Spain's David Ferrer bounced back from losing the China Open final 24-hours earlier with a 7-6 6-1 win over Frenchman Michael Llodra.

Roddick's compatriot John Isner narrowly avoided an early exit at the hands of Polish qualifier Lukasz Kubot, winning 4-6 7-6 7-6.