Yuki Bhambri recovered well from a poor start to beat New Zealand's Michael Venus in a three-setter and advance to the singles quarter-finals of the ATP Challenger event in Traralgon, Australia.
The world number one had arrived in Tokyo aiming to become the first man to win all four majors and an Olympic gold medal in the same calendar year. But that quest came to an end after he was beaten by fifth-ranked German Alexander Zverev in Friday's semi-final.
Hewitt, the 2001 champion, received his wildcard via a reciprocal agreement with Tennis Australia, which will grant an American a wild card into next year's Australian Open, and was among 16 players who received wildcard entries.
India's Leander Paes and Rohan Bopanna along with their respective partners crossed the opening hurdle of the men's doubles event with hard-fought victories, even as Sania Mirza posted an easy win in the women's doubles at the French Open in Paris, on Wednesday.
A summary of sports events and sports persons, who made news on Friday
A summary of sports events and sports persons, who made news on Sunday
Two time Miami Open winner Victoria Azarenka crushed Serbia's Jelena Jankovic.
A summary of sports events and persons who made news on Thursday
Frenchman Benoit lost his temper in the third game of the second set when top seed Tsitsipas halted the match to attend to a broken shoe lace.
Cycling: Olympic champion Vogel stable after operation
A summary of sports events and persons who made news on Sunday
A summary of sports events and persons who made news on Saturday