The 2026 World Baseball Classic is set to run from March 5–17 across four pool sites — Tokyo, San Juan, Houston, and Miami — with elimination rounds to follow. All 20 nations finalized their official 30-man rosters by late February, assembling a historically star-studded field featuring 78 All-Stars and a combined 2,471 home runs across the tournament.
Japan enters as one of the tournament's most formidable contenders, having completed an 11-day training camp in Miyazaki by late February with a full 30-man roster including Shohei Ohtani (confirmed as DH-only), Yoshinobu Yamamoto, and Roki Sasaki. Warm-up games were underway by early February, with a send-off event at Vantelin Dome scheduled for February 27. The Dominican Republic assembled what analysts described as potentially the most dangerous roster in tournament history, headlined by Vladimir Guerrero Jr. (in his first WBC appearance), Juan Soto, and Sandy Alcántara — though José Ramírez was confirmed unavailable for the first round and reliever Edwin Uceta withdrew with shoulder discomfort. Team USA countered with 22 All-Stars and a deep pitching staff anchored by Tarik Skubal, Logan Webb, and Paul Skenes, though workload management will limit Skubal to a single appearance.
The tournament has been significantly disrupted by an insurance eligibility crisis that triggered a wave of high-profile withdrawals across multiple nations between late January and late February. Stars including Mike Trout, Francisco Lindor, Jose Altuve, and Carlos Correa were all ruled ineligible, with Puerto Rico at one point considering a full withdrawal. South Korea's preparations were further hampered by injuries to pitchers Moon Dong-ju and Won Tae-in, as well as the exclusion of Kim Ha-seong and Tommy Edman. Mexico also lost Ramon Urias, Isaac Paredes, and José Urquidy to injuries. These disruptions have meaningfully altered the competitive calculus for several nations.
Heading into the tournament, Japan, the Dominican Republic, and Team USA appear to be the strongest contenders based on roster depth and pre-tournament preparations. Japan's organizational cohesion and pitching depth stand out, while the Dominican Republic's offensive firepower and the United States' breadth of All-Star talent make both credible challengers. Key uncertainties remain: the full downstream impact of the insurance-driven withdrawals is still being assessed, additional injury replacements could continue reshaping rosters, and South Korea — seeking to end three consecutive first-round exits — faces a steep climb given its disrupted preparations.