David Pauley

The Tigers opened the 2011 season with a rotation that consisted of Justin Verlander, Max Scherzer, Rick Porcello, Phil Coke and Brad Penny. With the non-Verlanders of that group (particularly Coke and Penny) underperforming, the team sought help for the back end of the rotation in July.

They got that help by acquiring Doug Fister (and reliever David Pauley) from the Mariners in exchange for four players: 20-year-old third baseman Francisco Martinez, 26-year-old outfielder Casper Wells, 25-year-old southpaw Charlie Furbush and a player to be named later that would be 22-year-old right-hander Chance Ruffin.

It's hard to believe that the Tigers, Mariners or even Fister himself were prepared for the results of this trade, so let's look at it on a player-by-player level…

The Major League Side

• Doug Fister: Fister was 27 at the time of the trade and had less than two years of Major League service time. He'd been solid but not spectacular in his brief career, as he was the owner of a 3.81 ERA, 5.2 K/9 and 1.9 BB/9 in 378 innings for the Mariners. He was in the midst of his best season when he was dealt, having pitched to a 3.33 ERA in 146 1/3 innings. Fister channeled his inner Greg Maddux upon arriving in Detroit though, allowing just 14 earned runs with a 57-to-5 K/BB ratio in 70 1/3 innings for the AL Central champs. He's significantly upped his strikeout rate in Detroit, and all told he's given them 232 innings of 2.95 ERA ball with a 7.5 K/9 and 1.6 BB/9. Fangraphs pegs Fister's tenure in Detroit at a whopping 5.8 wins above replacement. He's under control for another three seasons and is set to earn $4MM this year after being eligible for arbitration for the first time this past winter. 
• David Pauley: Pauley is perhaps the forgotten man in this trade, although there's probably a reason for that. The right-hander threw just 19 2/3 innings for the Tigers after the trade, allowing 10 runs on 26 hits and six walks with just 10 strikeouts. Pauley was ulimately released by the Tigers the following spring and appeared in just 16 2/3 innings for the Angels and Blue Jays last year.
• Charlie Furbush: Furbush floundered in Seattle's rotation in 2011, posting a 6.62 ERA in 10 starts. He thrived when moved to a bullpen role in 2012, however, thanks in large part to trading his curveball-changeup mix for a devastating slider to complement his heater. A triceps strain cost him a month of action last season, but when he was healthy he dominated lefties (.404 OPS) and held right-handed hitters in check as well (.637 OPS). Furbush can be a key bullpen piece in Seattle for a long time; he's not eligible for arbitration until the 2014-15 offseason, and he's under team control through 2017.
• Casper Wells: Wells brought a good amount of power and some excellent defense to the Mariners. He clubbed 17 homers in addition to a .225/.304/.406 batting line (102 OPS+) and was eight runs above average in 893 innings for Seattle, per The Fielding Bible. Wells is capable of handling all three outfield positions, but the Mariners made the questionable decision to designate him for assignment last week to give Jason Bay a chance.

The Prospect Side

• Francisco Martinez: Martinez was ranked as the Tigers' No. 4 prospect heading into the 2011 season, per Baseball America. He had reached Double-A at just 20 years of age — a rare feat that was a testament to the "live-bodied, athletic" label that BA slapped on him. He hit .310/.326/.481 for the Mariners' Double-A affiliate in 2011 following the trade, prompting BA to rank him as the team's No. 6 prospect entering 2012. BA praised his bat speed, stating that he "all the raw tools to fit the profile of an everyday third baseman, with the added bonus of plus speed." Martinez took a huge step backward in 2012, however, hitting just .227/.315/.295 in his second Double-A stint. He's dropped to No. 22 on BA's list of Top 30 Mariners prospects and No. 19 according to MLB.com's Jonathan Mayo. The Mariners tried Martinez in center field for 15 games in 2012 because of his plus speed, and Mayo notes that he'll play there exclusively in 2013. Mayo also points out that despite Martinez's struggles in 2012, he did improve his plate discipline — an area in which he'd previously struggled. He'll repeat Double-A in 2013, which isn't as grim as it sounds when considering he just turned 22 in September.
• Chance Ruffin: Ruffin had to be included as a PTBNL because he had been selected by the Tigers in the 2010 draft (48th overall). He had entered the 2011 season as the Tigers' No. 7 prospect, per BA, and he carried the same designation with the Mariners into the 2012 season. Ruffin actually pitched 14 innings for Seattle in 2011 (3.86 ERA, 15-to-9 K/BB ratio) but reported to Triple-A in 2012. The results were ugly. The Texas alum posted a gruesome 5.99 ERA in 70 2/3 innings and saw his K/9 plummet from 11.1 to 6.9, while his BB/9 increased to 4.5. The brutal season was enough to drop him off Mayo's Top 20 list and knock him back to 27th on BA's Top 30 entering the 2013 season. BA cites erosion of his solid command in college and inconsitent mechanics as the reason for his downfall: "He lands on a stiff front leg and throws across his body, hurting his ability to locate his pitches where he wants. His long arm swing in the back and lower release point make it easy for lefthanders to pick up his pitches, and they hit .294/.348/.516 against him last year." The good news is that BA still likes his stuff, praising a 90-93 mph fastball that can touch 95 mph when needed and a plus slider with late break, which BA calls a true out pitch.

It's easy to see why the Tigers look like big winners in this trade, as the two key pieces of the deal for the Mariners have both taken large steps backward in their development. However, Martinez won't be 23 until September — the same month in which Ruffin will turn 25 — and the team does seem to have a solid bullpen piece already at the Major League level in Furbush. Martinez won't be at such a large age disadvantage in the Southern League this year, which could benefit his numbers. Ruffin will also open the season at Double-A as the Mariners plan to convert him to a starting pitcher (hat tip: Ryan Divish of the Tacoma News Tribune).

At the time of the trade, ESPN's Keith Law wrote that the Mariners did well to acquire such a strong package for Fister and Pauley, but clearly the scales have tipped in Detroit's favor. A rebound from Martinez or successful to transition to starting for Ruffin would make this trade look fair, but even if that happens I doubt you'll ever hear the Tigers or their fans complaining about the Doug Fister trade.

Baseball America's 2013 Prospect Handbook was used in the creation of this post. Photo courtesy of USA Today Sports Images.