On the tour he had eight top-10 finishes, including third at the 1996 Scottish Open and the 1997 Volvo Scandinavian Masters, earning a total of €617,028.

[1] His biggest success in a major came at the 1995 Open Championship where he shot a first round of 68 (−4), one stroke off the lead.

John Daly eventually won at −6 after a playoff, and Hallberg finished tied for 68th along with Tiger Woods.

[2] Hallberg was in contention at the 1998 Volvo PGA Championship, the European tour's flagship event, held at Wentworth Club.

[3] The finish helped Hallberg reach a peak of 174 on the Official World Golf Ranking in 1998.