2017: .309/.379/.518, 14 HR, 10.4 BB%, 19.5 K%, 307 PA.
2018: .305/.364/.457, 30 2B, 17 HR, 8.3 BB%, 17.6 K%, 590 PA.
The rap on Martinez is poor fielding at both 1B and OF, but he reportedly has a strong throwing arm. Despite the poor fielding numbers, he was worth 1.6 and 2.3 fWAR in 2017 and 2018 respectively.
Now, it seems that one side or the other wants more in the trade than just a 1 for 1 of Martinez for Smith. Some analysts think the Giants might want Tyler O'Neill who is younger, has more years of control and is a better defender in the OF instead of Martinez. Here are O'Neill's numbers from last season:
AAA: .311/.385/.693, 26 HR, 10.6 BB%, 24.9 K%, 273 PA.
MLB: .254/.303/.500, 9 HR, 4.9 BB%, 40.1 K%, 142 PA.
As you can see, O'Neill hits for more power but has a higher K rate and a much shorter MLB track record than Martinez.
We also don't know that the Cardinals don't want more than Will Smith in return for Martinez.
Could the Giants get more for Smith by trading with another team? The Brewers are probably out after acquiring Alex Claudio from the Rangers. Almost every other contending team could use a good lefty reliever and it's too much to run down the whole list. Other possibilities that come to mind are the Nationals who might be willing to trade Michael Taylor who is a superb defender but a questionable bat. The Astros have not been willing to part with Kyle Tucker for JT Realmuto so it's doubtful they would give him up for a lefty reliever. What about Derek Fisher a prospect with a lot tools and a high ceiling but who has struggle to find traction at the MLB level so far? It seems like what the Cardinals can offer is more promising than either the Nationals or Astros.
So, you are the GM! Do you pull the trigger on a Will Smith for Jose Martinez trade or hold out for Tyler O'Neill or keep shopping with other teams? Personally if a straight up Smith for Martinez trade is on the table, I'd do it. Martinez may be 30 yo and a poor defender, but he's a proven MLB bat with 4 years of contract control left while Smith is due for free agency after the 2019 season. I might even be willing to include more in the deal if it's the Cardinals who want more.