Sample size is small, but Mets bullpen looks up to task without Edwin DiazMets relievers have posted MLB-best 0.66 ERA through four games4/3/2023, 2:44 PMAlex SmithEditorial ProducerMar 30, 2023; Miami, Florida, USA; New York Mets relief pitcher David Robertson (30) celebrates with catcher Omar Narvaez (2) after winning the game against the Miami Marlins at loanDepot Park. / Sam Navarro-USA TODAY Sports