The Steelers didn't have much go their way in the first half.
An Aaron Rodgers' pass pinballed around before A'Shawn Robinson intercepted it for the Bucs; Chris Boswell missed a 48-yard field goal wide left; and Germie Bernard had a first down beyond the line of scrimmage before going backward to try to make more yards on fourth down, and the Steelers turned it over on downs.
The Steelers finally got on the board on the final play of the first half on Boswell's 52-yard field goal.
Pittsburgh trails Tampa Bay 13-3 at halftime.
The Steelers outgained the Bucs 116 to 102 in the first half, but Tampa Bay scored on drives of 14, 60 and 33 yards.
Rookie Jalon Daniels, making his third career start, threw a 2-yard touchdown to wide receiver Emeka Egbuka for the game's only touchdown.
Chase McLaughlin has field goals of 43 and 47 yards.
Daniels is 11-of-18 for 62 yards and a touchdown, with Chris Godwin catching three for 28. Bucky Irving has nine carries for 35 yards.
Rodgers is 12-of-19 for 78 yards and a pick, with Bernard catching six for 49. Rico Dowdle has five carries for 29 yards.