Yankees' Luis Severino expected to begin rehab assignment SundaySeverino underwent Tommy John surgery in February 20205/31/2021, 2:44 PMRyan MorikFreelance Editorial ProducerFeb 16, 2020; Tampa, Florida, USA; New York Yankees starting pitcher Luis Severino (40) works out during spring training at George M. Steinbrenner Field. / Kim Klement-USA TODAY Sports