Tip from Jacob deGrom has helped Edwin Diaz rediscover dominant sliderDiaz has been a two-pitch pitcher with just one effective pitch for most of this season8/29/2019, 2:42 PMJul 23, 2019; New York City, NY, USA; New York Mets relief pitcher Edwin Diaz (39) pitches against the San Diego Padres during the ninth inning at Citi Field. Mandatory Credit: Brad Penner-USA TODAY Sports / Brad Penner