Padres' star reliever, Yuki Matsui, has been ruled out of the World Baseball Classic (WBC) for Japan due to a left groin strain. This injury has also cast uncertainty over his availability for San Diego's season opener in a month. Matsui, who signed a $28 million, five-year contract with the Padres, was still throwing off flat ground a week after cutting short a batting practice session due to the groin injury. The 30-year-old left-hander, who has a 7-3 record with a 3.86 ERA in 125 appearances in two seasons with the Padres, is now out of the WBC. Japan, the defending WBC champion, opens against Taiwan on March 6 at the Tokyo Dome. Matsui was replaced on Japan's roster by left-hander Yumeto Kanemaru of the Chunichi Dragons. While Matsui is uncertain about his opening day status, he is still hopeful to watch and cheer for Japan in the Miami round of the WBC. Before joining the Padres, Matsui had a 2.40 career ERA, 236 saves, and a 1.11 WHIP over 10 seasons in Nippon Professional Baseball. He was the youngest pitcher in the Japanese major leagues to reach 200 saves. This injury is a significant setback for Matsui and the Padres, as he was expected to be a key reliever for the team this season. The Padres' season opener is scheduled for March 26 at home against Detroit. The team will now have to adjust their plans and find a suitable replacement for Matsui's role. The injury also raises questions about the team's overall strategy and the impact it may have on their performance this season. The Padres' fans and management will be closely monitoring Matsui's recovery and hoping for a swift return to the field.