Marc Dull played solo Tuesday morning and made USGA history, becoming the first player to win a U.S. Amateur Four-Ball match as a single.

Rory McIlroy's PGA Championship performance overshadowed by driver controversy. USGA's non-conforming ruling led to equipment changes for several golfers.

Kerry Haigh, the chief officer for championships in the PGA, pointed out that the USGA does not want to get involved in whose driver is not in accordance with the rules.

The U.S. Open takes place June 12-15 at Oakmont Country Club in Oakmont, Pennsylvania. Here's a look at players who are currently in the field and how they qualified based on the USGA's order of exemption criteria (several players would have qualified via multiple categories).

Heading into the weekend, it was reported that McIlroy had to switch out his driver because his regular driver was deemed non-conforming to USGA standards. While the PGA and USGA dismissed that anything nefarious was behind a non-conforming test result, McIlroy's absence for four consecutive days of media was not a great look for him.

The USGA tested Rory McIlroy's driver and concluded that it did not meet established standards, forcing him to change it before the PGA Championship.

Rory McIlroy had to switch drivers ahead of the first round of the PGA Championship after his gamer was deemed non-conforming, according to a report by SiriusXM PGA Tour Radio. McIlroy is known as the best driver of the golf ball of his generation.

In golf, most rules questions concern commonplace scenarios. But every now and then, things get strange, leading to inquiries to the USGA.

Woods is now at the point in his career where he’ll need to rely on special exemptions to get into two of the four majors.