Texas, April 4 -- Scotland's Robert MacIntyre maintained his strong form with a round of 64 fora four-shot halfway lead at the Texas Open in San Antonio.

MacIntyre had four birdies in his last five holes with his playing partner and Ryder Cup team-mate Ludwig Aberg of Sweden his nearest challenger, according to BBC sport.

Starting on the back nine, the world number 11 put down a marker with an eight-foot eagle putt at the par-five 14th and followed that up with birdies at his next two holes.

The only blemish for the 29-year-old was a bogey at the 17th before he regrouped to finish with a flourish for a confidence boost ahead of the Masters which begins in Augusta on Thursday.

"I've been driving the ball nice," said the Scot. "I've got a...