Anderson (3-7) was charged with the loss Tuesday at Washington after surrendering six runs on 10 hits with four strikeouts and a walk across six innings.
The 31-year-old allowed three singles to load the bases before recording an out Tuesday, and he served up a grand slam to Yan Gomes as part of a five-run frame. The lefty settled down after that by allowing just one run given up on four hits over the following five innings, but the damage was already done. Anderson has a 4.89 ERA, 1.26 WHIP and 65:20 K:BB over 73.2 innings this season, and he tentatively lines up for a tough matchup with the White Sox next week.