DESPITE an ongoing no-ball problem, West Indies' fast bowler Kemar Roach says a more "relaxed" approach to the game has helped his emergence as the spearhead of the team's attack.

The Barbadian overstepped the front bowling crease on four occasions, but claimed 4-70 off 17.5 overs to assist the West Indies in dismissing New Zealand for 260 on the first day of the second Digicel Test match at Sabina Park yesterday.

Speaking to the media after the feat, the 24-year-old pacer, who was one of a few bright sparks during the recent Test tour of England, said as he matures he has become more confident in his ability.

"I'm more relaxed and more confident in my play now. It's just the no-ball problem I'm trying to iron out, but other than, that I'm very happy," he said.

"I've been doing a lot of work (to correct the no-ball problem). It's been on my mind but it still needs some more time to iron it out, so hopefully, after the Test match things will get better," he added.

Roach took eight wickets in two Test matches against England and last week guided West Indies to a 1-0 lead over New Zealand with a second-innings haul of 5-60 in Antigua. He also grabbed 2-55 in the first innings and was just pipped for the Player-of-the-Match award by spinner Sunil Narine.

Before this match, Roach grabbed 77 wickets at 28.14 in 20 outings.

Despite his four wickets yesterday, he said fiery compatriot Tino Best should take the credit for unsettling the Kiwis batsmen on a Sabina Park pitch that became easier to bat on as the day wore on.

"There was early moisture but after that it (the pitch) flattened out.

"I thought he (Best) was the pick of the bowlers. We were bowling in partnership. Tino is more attacking than I am and I supported from the next end. We had the opposition on the backfoot. Tino bowled very well today (yesterday)," he said.