Waldis Joaquín de la Cruz (born December 25, 1986) is a Dominican professional baseball pitcher.

Signed by the Giants in 2003, Joaquín reached the major leagues in 2009 and appeared in 10 games, which would be his highest total in an MLB season.

Part of the Opening Day roster in 2010, he pitched in four games during San Francisco's World Series championship season.

[1] His first professional experience came with the Dominican Summer League Giants in 2004; in 14 games (13 starts), he had six wins and a 1.61 earned run average (ERA).

[3] He did not play in 2006 due to surgery on his right elbow,[2] but he returned in 2007, for the Salem-Keizer Volcanoes of the Single-A (short season) Northwest League, with whom he went 3–0 with a 2.84 ERA, 30 strikeouts, and 16 walks in 38 innings.

[3] After the season, he made eight starts for the Waikiki BeachBoys of the Hawaii Winter Baseball League, posting a 2–3 record and a 5.97 ERA.

[4] He made his Major League debut on August 4, giving up one run on two hits in pitching the ninth inning in an 8–1 win over the Houston Astros.

[6] In 10 games with the Giants, which would be his most in an MLB season, Joaquín had no record, a 4.22 ERA, 12 strikeouts, and seven walks in 10+2⁄3 innings pitched.

[2] After the season, he made 16 relief appearances for the Gigantes del Cibao of the Dominican Winter League, posting a 1–0 record and a 2.35 ERA.

After he recorded the final two outs of the seventh inning against the Colorado Rockies, the Giants scored four runs in the eighth to take the lead and held on for a 6–5 victory, with Joaquín getting the win.

[15] In his last outing of the season, on September 24, he relieved starter Barry Zito with two runners on base and the Giants trailing the Arizona Diamondbacks 6–2.

Joaquín threw two wild pitches as he allowed both runners to score in addition to giving up three runs of his own in one inning of work; San Francisco went on to lose 15–2.

[1] On December 14, 2011, Joaquín signed a minor league contract with the Washington Nationals with an invitation to spring training.

Making 31 appearances for the Acereros de Monclova, he had a 2–2 record, eight saves, a 3.41 ERA, 32 strikeouts, and eight walks in 31+2⁄3 innings.

He also made 17 appearances for the Rieleros de Aguascalientes, posting a 2–1 record, three saves, a 3.74 ERA, 14 strikeouts, and eight walks in 21+2⁄3 innings.

He made one appearance for the Toros del Este of the Dominican Winter League in the 2018–19 offseason, pitching a scoreless inning.

Sam Corun of Bleacher Report mentioned in 2010 that his changeup needed to be better in order for him to walk fewer hitters.