Purchase a ticket and join the fans at a game at Singapore Sports Hub. If there's nothing on while you're there, you might like to check if there's a tour of the grounds.
If you're staying a while in Kallang, Singapore Sports Hub is an interesting place to start your sightseeing. This sporting facility is one of many attractions that'll keep you occupied here. Universal Studios Singapore, Haji Lane, and Chinatown Heritage Center are also waiting for you nearby.