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Last week a pair of new Callaway clubs appeared for the first time on the United States Golf Association and R&A’s conforming driver lists. The company did not provide details about the Mavrik and Mavrik Sub Zero, but once those drivers were added to the lists, they became available for use in competition and it appears that Xander Schauffele put one into play on Thursday at Royal Melbourne Golf Club during the open matches at the Presidents Cup.

As you can see in this close-up photo of the driver Schauffele used in his opening-round match with Patrick Cantlay against Sungjae Im and Adam Hadwin, the bottom of the club clearly says Mavrik.

With a weight visible in both the back and behind the leading edge, it appears that Schauffele is using the Sub Zero version of the Mavrik driver.

Historically, Sub Zero versions of Callaway drivers spin less than standard versions and produce a lower ball flight.

PORTRUSH, Northern Ireland -- Xander Schauffele was unhappy with the R&A over a driver-testing operation in advance of The Open that did not include all players but found his club to be nonconforming.

The American, who finished second earlier this year at the Masters and was in contention at last year's Open at Carnoustie, said he had a 'bit of a run-in' with the R&A over the matter.

'They only test 30 players,' Schauffele, who is at 4-under 138, said after the second round at Royal Portrush. 'I thought it was a little bit unfair. I would gladly give up my driver if it's not conforming. But there's still 130 other players in the field that potentially have a nonconforming driver as well. Had words with them, and hopefully they take my comments seriously and my concern.

'It wasn't my plan to show up Tuesday morning of a major and doing driver testing here. It's not really what I want to be doing.'

Drivers are tested for 'spring-like effect' and cannot surpass a limit of 'coefficient of restitution' or COR.

Schauffele, who plays with Callaway equipment, had no issue with the R&A deeming his club nonconforming. His issue was simply that not all are tested. Tiger Woods is among the players whose driver was tested this week, and he said on Tuesday that his passed.

The R&A does not say how close the club was to passing, just whether it passed or failed.

'We randomly selected 30 players for driver testing as we did at last year's championship and we can confirm the statement that Xander's driver failed,' the R&A said in a statement. 'We have worked with Xander and his manufacturer to ensure that he has a number of conforming drivers he can use this week.'

That the results became public is also something that Schauffele took issue with.

'They pissed me off because they attempted to ruin my image by not keeping this matter private,' Schauffele said after his third-round 69 on Saturday.

'It's an unsettling topic. I've been called a cheater by my fellow opponents. It's all joking, but when someone yells 'cheater' in front of 200 people, to me, it's not going to go down very well. ... It was just handled unprofessionally.'

Schauffele said he was struggling to find the right one.

Drivers Android

'I was doing driver testing up until Wednesday,' Schauffele said. 'And then [Thursday] it wasn't really matching my bag, which was a bummer. I was getting a little upset on the golf course. And [Friday] I was testing a little bit on the range again with two different heads. But moved a few weights around and sort of found a good setting, I guess.'