After the season, the New York Yankees selected Waldichuk in the fifth round (165th overall) of the 2019 Major League Baseball draft.[8] He signed with the Yankees and made his professional debut with the Pulaski Yankees of the Rookie-levelAppalachian League, going 0–2 with a 3.68 ERA over 29+1⁄3 innings.[9] Waldichuk did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[10] To begin the 2021 season, Waldichuk was assigned to the Hudson Valley Renegades of the High-A East.[11] After throwing 30+2⁄3 scoreless innings to begin the year, he was promoted to the Somerset Patriots of the Double-A Northeast.[12] Over 16 games (14 starts) with Somerset, Waldichuk pitched to a 4–3 record and 4.20 ERA with 108 strikeouts over 79+1⁄3 innings.[13]
Waldichuk returned to Somerset to begin the 2022 season.[14] After four starts in which he pitched to a 4–0 record and 1.26 ERA over 28+2⁄3 innings, he was promoted to the Scranton/Wilkes-Barre RailRiders of the Triple-AInternational League.[15] Waldichuk was selected to represent the Yankees at the 2022 All-Star Futures Game.[16] Over 11 starts with the RailRaiders, Waldichuk went 2-3 with a 3.59 ERA and 70 strikeouts over 47+2⁄3 innings.[17]
In 2023, Waldichuk made 35 appearances (22 starts) for Oakland, registering a 4–9 record and 5.36 ERA with 132 strikeouts across 141 innings of work.[22] Following his last start of the 2023 season, an MRI revealed that Waldichuk had suffered a flexor tendon strain and UCL sprain in his pitching elbow. He underwent a procedure to remove scar tissue from the same elbow and elected to further undergo a non–surgical recovery process.[23]
On May 16, 2024, Waldichuk underwent Tommy John surgery, causing him to miss the remainder of the season.[24] He was activated from the injured list on July 19, 2025, and was subsequently optioned to Triple-A Las Vegas.[25] Waldichuk made 17 appearances (16 starts) split between Las Vegas and the Single-A Stockton Ports, accumulating a 2-6 record and 8.17 ERA with 68 strikeouts over 54 innings of work. On December 22, Waldichuck was designated for assignment following the Athletics trade for Jeff McNeil.[26]
Washington Nationals
On January 8, 2026, Waldichuk was claimed off waivers by the Atlanta Braves.[27] He was designated for assignment by the Braves on January 10.[28] On January 12, Waldichuk and Brett Wisely were traded to the Tampa Bay Rays.[29] He was designated for assignment by the Rays on February 2.[30] The Washington Nationals claimed Waldichuk off waivers on February 5.[31]
Waldichuk broke camp with the Nationals but struggled over the first two weeks of the season, giving up a three-run home run on his first pitch in the major leagues since 2023[32] and pitching to a 6.75 ERA in five games. He suffered an elbow injury while throwing a pitch on April 12, 2026, at American Family Field[33] and was placed on the injured list the next day. Manager Blake Butera disclosed that Waldichuk had been recommended for a second career Tommy John surgery due to elbow ligament damage.[34]
