Joaquin Niemann receives a two-stroke penalty after a club-throwing incident during the first round of the 2026 U.S. Open at Shinnecock Hills. Multiple outlets report that the USGA deems the behavior “serious misconduct” under the Rules of Golf, specifically citing Rule 1.2b as the basis for the penalty. Niemann throws his club on the sixth hole and is assessed the two-shot loss under the new major championship code of conduct, a first for a U.S. Open competitor under that framework, according to reports. Niemann later says he is not proud of the “serious misconduct” but argues the penalty may be excessive, with one report noting he believes he is “extra-penalized.” Another outlet adds that he follows up the incident by playing well in the second round, posting a 5-under 65 to make the cut. Coverage also describes Niemann’s reaction to the ruling, including what he says USGA rule officials told him after the penalty. The penalty affects his standing for the tournament, though he finishes the week after rebounding from the opening-round setback.