Golden State Warriors head coach Steve Kerr says his side needs to correct their defensive issues on the road after slumping to a 2-12 record away from home with Tuesday's 128-111 loss to the Milwaukee Bucks.

The reigning champions, playing in the first leg of a six-game road trip, were brushed aside by the Bucks, who were led by Giannis Antetokounmpo with 30 points, 12 rebounds and five assists at the Fiserv Forum.

The defeat means the Warriors are ranked 29th in the NBA on the road this season and have an 0-8 record on the road to teams with plus-.500 records. 

Golden State has also given up at least 114 points in every road game this season, which Kerr was quick to point out.

"In the road losses, our defense has been bad," Kerr told reporters. "For whatever reason, the splits are pretty dramatic. Our defense is pretty good at home and bad on the road. We've got to turn that around."

Kerr also pointed to the free-throws as an issue, with the Bucks scoring 26-of-32 from the stripe compared to Golden State's 15-of-19.

"It's basically the difference in the game when we lose," he said. "It usually feels like that's the difference.

"At half-time it's a 10-point game and they had 10 more free-throws than us, despite the fact that we weren’t shooting the ball very well, we weren’t playing very well, it was a six-point game with a minute and half left in the second quarter. We were right there but the free-throws are a killer."

Kerr along with Stephen Curry both received technical fouls in the first quarter, after a play where last season's Finals MVP appeared to be fouled by Wes Matthews as he shot a three-pointer, yet no call was forthcoming as Bobby Portis scored down the other end, leaving the pair incensed.

"There were several non-calls in the paint," Kerr said. "I felt like we were on the bad end of things to start the game. Steph Curry gets hit on the head on a three-point shot, that needs to be called. That's what he does. That's Steph Curry. You can't miss that.

"We were getting frustrated with some no-calls and it led to a pretty choppy night."

Kerr and Curry's technical fouls were two of five for the game, including Bucks head coach Mike Budenholzer.

"I have no comment about my technical," Budenholzer said. "The game just had a really poor flow for a while. Lots of free-throws, delays of game, technicals, everything, the flow tonight was poor."