Willy Del Jesus Aybar Marquez (born March 9, 1983) is a Dominican former professional baseball infielder.

He previously played for the Los Angeles Dodgers, Atlanta Braves and Tampa Bay Rays of Major League Baseball (MLB).

In his short time on the big league roster, Aybar made strides in impressing then-manager Jim Tracy.

After they also signed Ramón Martínez to join Óscar Robles in being the primary backups, Aybar found himself out of a job.

On May 12, 2006, Aybar received another opportunity to be the starting third baseman when Mueller was placed on the 15-day disabled list for arthroscopic knee surgery, he was recalled from the Dodgers Triple-A affiliate, the Las Vegas 51s.

This was a rare move by the Braves organization, and Aybar's lack of participation caused third baseman Chipper Jones to remark "I didn't even know he was still on the team."

He had not been heard from for some time and failed to report to New York for a meeting with major league officials Friday, April 20, according to the Atlanta Journal-Constitution.

[4] He hit a home run in the seventh and deciding game of the ALCS, a 3–1 Rays victory that sent the franchise to the World Series for the first time.

According to the police report, Aybar, who has also battled alcohol problems, was found "extremely intoxicated" at the front entrance of the SeaTac Hilton hotel.

Police documents stated they went to Aybar's room, where his wife was crying and holding a bloody towel to her face and had a cut lip and an abrasion on her forehead and cheek.