David Robertson has pitched to the tune of 0.6 fWAR and a sterling 2.06 ERA through the first half of the MLB season. The New York Mets, meanwhile, have been atrocious. Since Robertson has been good, he is a prime candidate to be traded. Here are five teams who should look into him: #5) New York YankeesDavid Robertson on the New York YankeesDavid Robertson is a former Yankee and the New York Yankees have the 19th-best bullpen in Fangraphs fWAR. Their pen ERA is tops in the league and they have a weak offense, but adding relief help will be easier to accomplish. #4) Tampa Bay RaysIf there's a team out there that can maximize the talent of an aging reliever, it's the Tampa Bay Rays. As they fend off the Baltimore Orioles, a deeper pen (ranked 21st on Fangraphs) is key. #3) Cincinnati RedsThe Cincinnati Reds are emerging as a real contender in the NL Central, but their 23rd-ranked bullpen could use another arm. Robertson has been good, so the Reds should consider him. #2) Minnesota TwinsSNY@SNYtvAND THE BALLGAME IS OVER!David Robertson closes it out for Kodai Senga and the Mets win an incredible game!1638120AND THE BALLGAME IS OVER!David Robertson closes it out for Kodai Senga and the Mets win an incredible game! https://t.co/ID51BIUWfaThe Minnesota Twins are suddenly in the middle of a heated battle for the AL Central. They'll be buyers and they could add to a bullpen that's lacking in depth. This will help them pull away from the pack a bit. #1) Miami MarlinsJimmy Nolan@NolanShowLiveMy New York #Mets 1st Half Grades:A+: David RobertsonA-: Brandon Nimmo, Francisco Lindor, Kodai Senga, Tommy PhamB+: Francisco Alvarez, Justin Verlander, Brooks RaleyC: Brett Baty, Mark CanhaD: Adam Ottavino, Carlos Carrasco, Starling MarteF: Max Scherzer, Pete… twitter.com/i/web/status/1…1287My New York #Mets 1st Half Grades:A+: David RobertsonA-: Brandon Nimmo, Francisco Lindor, Kodai Senga, Tommy PhamB+: Francisco Alvarez, Justin Verlander, Brooks RaleyC: Brett Baty, Mark CanhaD: Adam Ottavino, Carlos Carrasco, Starling MarteF: Max Scherzer, Pete… twitter.com/i/web/status/1… https://t.co/6PA52Loz0WThe Miami Marlins rank 13th in Fangraphs' bullpen depth, which suggests that they're a pretty solid pen. This may be the case, but adding to it is never a bad thing. As they chase the playoffs, they need to get stronger and David Robertson can certainly help.