Playing for Tohoku Fukushi University, Wada was MVP of the Sendai Big Six University League as a senior and won the batting title. He hit.429 for Kobe Seiko in the industrial leagues, then in 1996 was drafted in the fourth round of the Japanese draft by the Seibu Lions.
Professional career
Seibu Lions
He hit.190 in 1997 when he first played for Seibu and was 0/1 in the 1997 Japan Series. In 1998, Wada hit.333 in 36 games for Seibu and split his time between catching and the outfield. He went 0/2 in the 1998 Japan Series. In 1999, he batted.271 while again seeing limited time behind the plate, with Tsutomu Ito starting. In 1998, Wada began playing semiregularly as an outfielder, batting.306, the same average he recorded the next year. He still not yet an everyday player. In 2002, Wada finally became a starter and responded by batting.319 with 33 homers. Playing left field and DH, he made the Best Nine as the top designated hitter in the Pacific League. He finished third in slugging behind teammates Alex Cabrera and Kazuo Matsui. His Japan Series woes continued with a miserable 0/15 in the 2002 Japan Series, as Seibu got swept by the Yomiuri Giants. Wada did even better in 2003, hitting.346, homering 30 times, scoring 87 runs and driving in 89. He made his first All-Star team and was on the Best Nine as an outfielder alongside Yoshitomo Tani and Tuffy Rhodes. Wada finished third in the Pacific League in average and slugging. He was fourth in OBP behind Ogasawara, Tadahito Iguchi and Nobuhiko Matsunaka. 2004 was an eventful year for Wada. He hit.320, homered 30 times and drove in 89 despite missing time for the 2004 Olympics. For the bronze medal-winning Japanese club in the Olympics, he hit.333 and slugged.636. Hitting cleanup or fifth for Seibu, he was honored again as an All-Star and Best Nine. In the 2004 Japan Series, he finally broke his postseason struggles in a big way by batting.310 with four homers in Seibu's victory over the Chunichi Dragons. Wada broke a 54-year-old record for most extra-base hits in a Japan Series with eight, breaking Isao Harimoto's record of 7 in the 1950 Japan Series. His 26 total bases were a Japan Series record, breaking Yasumitsu Toyoda's 46-year-old record of 25; he tied the record with four homers in a series and his two homers in game six helped Seibu to a 4-2 victory to tie the series at three. Takashi Ishii beat him out for Series MVP honors, though. Wada continued his dazzling pace in 2005, batting.322, though his 27 homers were his lowest total in four years. He made his fourth straight All-Star contingent. He edged Julio Zuleta and Matsunaka for the first Pacific League batting title won by a right-handed hitter since Hatsuhiko Tsuji in 1993. He was fourth in slugging, third in OBP, tied for third in runs, first in hits, second in doubles. Wada was on the winning Japanese club in the 2006 World Baseball Classic and went 0 of 2 with one strikeout in two games as the backup left fielder to Hitoshi Tamura. Wada hit.298 in 2006 and finished third in the PL with 95 RBI, second to Fernando Seguignol with 34 doubles, eighth with 144 hits, seventh with 239 total bases, tied for seventh with 72 runs, second with 78 walks. He was fourth in OBP and eighth in slugging. His home run total continued to fall, down to 19, but still tied for seventh in the PL. He re-signed for Seibu for ¥275 million plus incentives.
Chunichi Dragons
At the end of the 2007 season, Wada opted for free agency and joined boyhood club and reigning Japan Series champions, the Chunichi Dragons in a 3-year, ¥840 million deal to replace MLB bound right-fielder, Kosuke Fukudome.
