From SABR member Aaron Gleeman at Baseball Prospectus on June 28, 2016:
Troy Tulowitzki returned to Coors Field last night for the first time as a visiting player, facing the Rockies nearly 11 months after the blockbuster trade that sent the five-time All-Star shortstop from Colorado to Toronto. Because the Blue Jays went 31-10 with Tulowitzki in their lineup last season and made the playoffs for the first time since 1993 the trade was immediately labeled a success, but Tulowitzki didn’t actually play all that well in those 41 games and his contract meant neither team involved was viewing the deal as strictly a short-term move. Tulowitzki’s mediocre performance has continued this season, which has to be worrisome for the Blue Jays given that he’s 31 years old and signed through 2020 at an average annual salary of around $20 million.
When the Blue Jays acquired Tulowitzki they did so knowing that his raw hitting numbers would decline because that’s just how things work with Rockies hitters. Coors Field undeniably boosts offense, often to extreme degrees, and hitters departing the Rockies can generally be counted on to post less gaudy raw numbers in their new homes. However, projecting how Rockies hitters will fare elsewhere can be tricky due to a potential “hangover” effect playing home games at altitude can have on a player’s performance in road games. In other words, it’s not always as simple as taking a longtime Rockies hitter’s road numbers and penciling those in as his overall numbers, because the road numbers might be underrepresenting his true, non-Coors Field talent level.
Tulowitzki spent the first decade of his career calling Coors Field home and took full advantage, hitting .321/.394/.558 in 526 games there compared to .276/.349/.468 in 522 road games. Even with a hangover effect possibly dragging them down those road numbers alone would have made Tulowitzki the best-hitting shortstop in baseball from 2006-2015, so the Blue Jays gladly would have signed up for .276/.349/.468. Instead he’s hit just .226/.306/.405 in 95 games following the trade, including .214/.294/.423 in 54 games this year. Once the king of good-hitting shortstops, his .717 OPS ranks 15th among the 26 players who’ve logged at least 50 games at the position this season and Tulowitzki is the third-oldest player in that group. His post-trade fall is magnified even further by the emergence of a potentially historic group of young shortstops.
Read the full article here: http://www.baseballprospectus.com/article.php?articleid=29672
Originally published: June 28, 2016. Last Updated: June 28, 2016.