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Seibu Lions’ Tatsuya Imai To Be Posted Nov. 19, Opening 45-Day MLB Bidding Window

The 27-year-old Boras client comes off a 1.92 ERA season, positioning him as a prime target.

Overview

  • Scott Boras said the posting becomes official on Nov. 19, which triggers a 45-day period for all 30 MLB teams to negotiate.
  • Imai logged 24 appearances in 2025 with a 10-5 record, a 1.92 ERA, and 178 strikeouts over 163.2 innings.
  • Public projections vary, with MLB Trade Rumors modeling about $150 million over six years and ESPN reporting estimates ranging from $80 million to $200 million.
  • Any contract will require a posting fee to Seibu under the MLBNPB formula of 20% of the first $25 million, 17.5% of the next $25 million, and 15% above $50 million.
  • Analysts view Imai as a potential mid-rotation starter with a fastball touching 99 mph and effective splitter and slider, and early links include the Mets and Yankees.