It could be one of the ugliest days in Yankees history.

On Friday night, the most iconic uniform in sports will be tarnished when the Yankees take the field for the first time with Starr Insurance patches stitched to their pinstripes.

Then, the Yankees — riding a four-game losing streak — will walk a tightrope in front of an irate home crowd, prepared to pounce on any mistake made by the World Series contender turned last-place team.

Back in The Bronx for the first time in nearly two weeks, the Yankees make their second-half home debut against the Royals, returning with no room for error and no reason for optimism after going 1-5 on a trip to Colorado and Anaheim.