The Phoenix Suns have shot their way to a 2-0 lead in the NBA Finals with a 118-108 Game 2 victory over the Milwaukee Bucks on Thursday.

The Suns drained 20 three-pointers, including eight in the first quarter, shooting at 50 per cent from beyond the arc on their way to victory, headlined by young guard Devin Booker with 31 points, five rebounds and six assists.

Booker hit seven-from-12 three-point attempts, while veteran Chris Paul scored three three-pointers in his 23 points for the game, along with eight assists.

Mikal Bridges scored a personal playoffs-high 27 points, while Deandre Ayton was slightly subdued in the paint, finishing with 10 points and 11 rebounds.

Giannis Antetokounmpo, in his second game back from his knee hyperextension, was heroic for the Bucks with 42 points including a massive third period but could not inspire his side to victory.

The Greek forward shot at 68.2 per cent from the field, but only hit one from five beyond the arc. He also had 12 rebounds, three blocks and four assists.

But Antetokounmpo lacked support, with Khris Middleton struggling with 11 points shooting at 31.3 per cent from the field. Jrue Holiday managed 17 points but only shot seven from 21 from the field.

The Bucks started strong in the first quarter, scoring 20-0 in the paint and leading by as much as nine points, before Phoenix hit back with a 30-16 second quarter to open up an 11-point half-time lead.

Antetokounmpo scored 20 points in the third quarter to keep Milwaukee in the hunt, trailing by 10 points at the final change. The Greek's 20 was the most in an NBA Finals quarter since Michael Jordan's 22 against the Suns in 1993.

The Bucks got within five points in the last but the Suns always had the answers when challenged, with Booker and Paul knocking down crucial final quarter threes.

Booker was benched late, in order to preserve his body after playing 44 minutes, after Phoenix lost another player Torrey Craig to injury, to join Dario Saric on the sidelines after the Croatian tore his ACL in Game 1.