Golf star Tiger Woods struggled through most of the 139th Open Championship, mainly because of a switch to a new putter designed by Nike.

According to Woods, he used the Nike Method putter with hopes of it helping him adjust to the slower speed of the greens at the Old Course at St. Andrews, Scotland. Woods hit the ball well off the tee , but struggled putting. He ended up scoring a frustrating 1-over-par 73 Saturday to fall well behind leader Louis Oosthuizen, who finished at 15-under-par.

“I hit it good today,” Woods told reporters. “I mean, I striped it all day. I just didn’t get anything out of the round. I couldn’t build any momentum and wasn’t making any putts.”

Woods came into the final round Sunday attempting to pull off something he’s never done before: claim a major championship win by coming from behind in the last round. In each of his 14 major victories, Woods has held the lead going into the final round.

He told reporters that he switched back to the to the Scotty Cameron putter made by Titleist. He has used the Titleist putter since 1999.

“I don’t know what’s going to happen,” he said before teeing off. “The forecast is for it to be windy and possibly a few showers here and there, but you don’t know. We’ll see what happens.”