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It’s easy to look back at the deal that brought Joe Nathan, Francisco Liriano, and Boof Bonser to the Twins for A.J. Pierzynski as an obvious one to make. Joe Mauer was coming off a solid season between A and AA, and it was a foregone conclusion that he would take over behind the plate sooner rather than later. For that to happen, Pierzynski needed to clear out or change positions, and the latter wasn’t happening, so of course Ryan would deal him to clear space for Mauer.
But while Mauer was hitting well in the minors -- particularly for his age level -- he wasn’t beating down the doors. As a 20 year old, he hit .338/.398/.434 including a stint in the Arizona Fall League; Pierzynski hit .312/.360/.464 in the majors that season, earning a deserved All-Star selection. And at 26, it isn’t as though Pierzynski was at the end of his career, or even at the end of his prime, so Ryan’s decision to move him after back-to-back great season could have backfired badly had Mauer not made the jump as well as he did.
As it turned out, Ryan moved Pierzynski at the absolute peak of his value. While he remained a solid catcher through his age-38 season -- which shouldn’t be glossed over, that’s an incredible achievement -- he never returned to the All-Star Game and only twice put up above-average offensive numbers.
In return for this desirable asset, Ryan got a once-prized prospect who had lost a bit of his luster (Bonser), a converted outfielder who was coming off back-to-back seasons of injury issues (Liriano), and a former shortstop who wasn't far removed from shoulder surgery himself (Nathan).
A former first-round pick, Bonser had the pedigree to succeed, and (just like many of Ryan’s other finds) he did make contributions to the major league team, even if he was clearly the worst of the acquired players. He gave the 2006 Twins 18 starts and ended the year fractionally above average by ERA+ and with a 1.0 fWAR. Great? Hardly. But he was just 24, so it would have been a solid foundation for him to build on as he rose to being a mid-rotation piece...except that those 18 starts marked the best year of his career. Even if he wasn’t spectacularly bad, Bonser neither generated enough groundballs nor missed enough bats to make it in the majors and a torn labrum in 20009 ended his time with the Twins.
Liriano’s arm had already been an issue when the Twins acquired him and it would continue to plague him throughout his career, though to his credit, he has continued to rehab and make it back to the majors every time he has gone under the knife. Still, his career would be typified by terms like “serviceable” and “solid” were it not for his unforgettable rookie season in 2006.
His 2006 line is staggering: 3.6 fWAR, 1.00 WHIP, 2.16 ERA, and 10.71 K/9, but that actually undersells how good he was that year. Liriano wasn’t well-suited to pitching out of the bullpen, but that’s how he began the season (even recording a three-out save in a game which the Twins won by 10 runs, because of course he did) which included a three-inning relief appearance after the Tigers bombed Carlos Silva out of an April game. Liriano fared little better, giving up 5 ER in just 3 IP. Look at his numbers once he joined the rotation full time in May, and they’re even better: 1.92 ERA, 0.91 WHIP, 112/28 K/BB ratio, and opposing hitters hit a pathetic .181/.244/.281 off of him. But the arm issues caught up to him once again. He threw just six innings after July 28 and would miss all of the 2007 season recovering from Tommy John surgery.
His 2010 season showed glimpses of the form that had made him so unbelievably dominant in 2006, and the fact that he had 31 healthy starts means his counting stats look better, but he never did fully recover the form he had shown. He gave everyone a season to dream on and enough flashes of brilliance to bounce around the league for another decade and counting, but the consistent excellence he showed once seems to be part of his legend rather than his actual legacy.
The Baseball Prospectus comment on Nathan prior to the 2003 season began “Nathan continued his comeback from shoulder surgery in 2000, with a year that was impressive only relative to the year before. He was never a great prospect, even before the shoulder woes, but he could be a serviceable innings-eater in middle relief.” Put another way: If you don’t have a player like this in your minor league system, the cupboard is so impossibly bare, it beggars belief. You don’t trade for players like this, they just appear on your AAA roster as if placed there by an occult hand. And to be fair, eating innings is exactly what Nathan did in 2003: His first year as a full-time reliever in the majors, Nathan appeared in just shy of half the Giants’ games, racking up 79 innings in 78 starts.
Prior to the 2004 season, Prospectus noted that Nathan had looked leaps and bounds better the previous year than he ever had before -- and how right they were! -- but cautioned that this could be an aberration because it seemingly came out of nowhere. Here, too, they were right: 2003 was an aberration for Nathan, because for the decade following, he never again had a season as bad as 2003 when he was healthy for a full year.
2004 started with a closer-by-committee set-up with Nathan, Juan Rincon, and even a fleeting appearance from Joe Roa before he was relegated to mop-up duty, but by mid-April, the job was Nathan’s to lose. The next time someone besides Nathan would lead the team in saves was 2010, when Jon Rausch stepped in while Nathan was recovering from Tommy John surgery.
Like Liriano, there were serious concerns about Nathan’s ability to stay healthy during his time in the minors, but after he moved to the bullpen, those concerns all but vanished. He finished his career with the eighth most saves of all time and appeared in the 54th most games. Of the three players acquired for Pierzynski following the 2003 season, Nathan had by far the best career; taking everyone involved in the deal, only Mauer has a claim at being a better player than Nathan.
Whatever the Twins thought they were getting in Nathan, no matter how much Ryan and his staff believed that 2003 was indicative of what he could be, Nathan exceeded even the most optimistic expectations. He filled a hole that had existed since the end of Rick Aguilera’s second stint with the team (Mike Trombley notwithstanding) and held it down through some of the team’s best years post-1991. It’s fitting to see him end such a stellar career as a Twin.
The Pierzynski-for-prospects deal is widely considered a heist, Ryan’s Robbery if you will. Some of that is due to Pierzysnki’s decline and some is due to Liriano’s apotheosis in 2006, but given that Bonser added almost nothing and Liriano was more frustration than fulfillment, the idea that the trade was as lopsided as it was confirms just how good Nathan was: If the deal had been a straight Nathan-for-Pierzynski swap, would the reviews be all that much less glowing?
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