This is just a short post dedicated to how well Rasmus has played so far this year.
Before the season started, this site was divided about where Rasmus should play this year. Some wanted him to stay in the minors given that we already had tremendous depth in the outfield and we didn't want to start his arbitration clock early. Others believed his was ready to play everday and wanted to see him in the majors. He ended up making the club as part of a 4 man outfield rotation. Over a third of the way into the season, he has been our most productive outfielder so far... and it's not even close.
After his recent hot streak, he now has a slash line of .269/.325/.469 in 194 at bats. That is good for a .346 wOBA and 2.6 offensive runs above average. Defensively, he has been amazing, putting up a combined 11.6 UZR rating in the OF. If you combine the two, add a positional adjustment and a replacement level adjustment based on playing time, he has added over 2 wins above a replacement level player so far.
Our other 3 outfielders, on the other hand, have been worth a combined 1.3 WAR despite having nearly 3 times more plate appearances than Rasmus. So I think it is safe to say that Rasmus will be getting the bulk of the playing time in center going forward.
ZIPS projects him to have a .329 wOBA for the rest of the season, which would make him exactly league average. Assuming he plays nearly every day, he would receive about 350 more at bats. Lets assume that his early season defensive dominance is a fluke, and his is just a +10 defender over a full season, which is what his minor league total zone numbers suggests he is. That would suggest that he would save about 5 more runs the rest of the season.
If you combine his current numbers and his *rough* projections the for the rest of the season, he would be worth roughly 4 WAR this year. That would not only make him the runaway rookie of the year, it would make it one of the best players in the league.