WASHINGTON – Reigning US Open champion Wyndham Clark suffered a back injury in a gym workout and is questionable for this week’s PGA Houston Open, with his planned US Masters debut only two weeks away.

World No. 4 Clark, who won at Pebble Beach in February and finished second to the top-ranked Scottie Scheffler in March at Bay Hill and The Players Championship, hurt himself hoisting weights on March 25 in Scottsdale, Arizona.