Updated List of known committed players so Far (stolen from r/InternationalBaseBall):
Australia: Liam Hendriks (Chicago White Sox), Curtis Mead (Tampa Bay Rays minors)
Canada: Freddie Freeman (Los Angeles Dodgers), Charles Leblanc (Miami Marlins), Josh Naylor (Cleveland Guardians), Cal Quantrill (Cleveland Guardians), Abraham Toro (Seattle Mariners)
Colombia: Jorge Alfaro (San Diego Padres), Nabil Crismatt (San Diego Padres), Jeter Downs (Boston Red Sox), Sandy Leon (Free Agent), Reiver Sanmartin (Cincinnati Reds), Donovan Solano (Free Agent), Jose Quintana (Free Agent), Harold Ramirez (Tampa Bay Rays), Julio Teheran (Sultanes de Monterrey, LMB), Gio Urshela (Minnesota Twins)
Dominican Republic: Sandy Alcantara (Miami Marlins), Genesis Cabrera (St. Louis Cardinals), Emmanuel Clase (Cleveland Guardians), Rafael Devers (Boston Red Sox), Wander Franco (Tampa Bay Rays), Yimi Garcia (Toronto Blue Jays), Vladimir Guerrero Jr. (Toronto Blue Jays), Cristian Javier (Houston Astros), Manny Machado (San Diego Padres), Starling Marte (New York Mets), Christopher Morel (Chicago Cubs), Jose Ramirez (Cleveland Guardians), Gary Sanchez (Free Agent), Juan Soto (San Diego Padres)
Great Britain: Jazz Chisholm (Miami Marlins), Harry Ford (Seattle Mariners), D'Shawn Knowles (Los Angeles Angels minors), Ian Lewis (Miami Marlins minors), Vance Worley (Kane County Cougars, AA)
Israel: Harrison Bader (St. Louis Cardinals), Jake Bird (Colorado Rockies), Richard Bleier (Miami Marlins), Jake Fishman (Free Agent), Dean Kremer (Baltimore Orioles), Ryan Lavarnway (Miami Marlins), Eli Morgan (Cleveland Guardians), Joc Pederson (Free Agent), Kevin Pillar (Free Agent), Robert Stock (Doosan Bears, KBO), Zack Weiss (Los Angeles Angels)
Italy: Daniel Castano (Miami Marlins), Ben DeLuzio (St. Louis Cardinals), Matt Festa (Seattle Mariners), David Fletcher (Los Angeles Angels), Dominic Fletcher (Arizona Diamondbacks minors), Vito Friscia (Philadelphia Phillies minors), Sam Haggerty (Seattle Mariners), Nicky Lopez (Kansas City Royals), Trey Mancini (Free Agent), Joey Marciano (San Francisco Giants minors), Miles Mastrobuoni (Tampa Bay Rays), Adam Ottavino (Free Agent), Andre Pallante (St. Louis Cardinals), Vinnie Pasquantino (Kansas City Royals), Jordan Romano (Toronto Blue Jays), Mitchell Stumpo (Arizona Diamondbacks minors), Brett Sullivan (San Diego Padres minors)
Japan: Shohei Ohtani (Los Angeles Angels), Seiya Suzuki (Chicago Cubs)
Mexico: Randy Arozarena (Tampa Bay Rays), Javier Assad (Chicago Cubs), Andres Munoz (Seattle Mariners), Isaac Paredes (Tampa Bay Rays), Manuel Rodriguez (Chicago Cubs), Rowdy Tellez (Milwaukee Brewers), Julio Urias (Los Angeles Dodgers), Jose Urquidy (Houston Astros), Alex Verdugo (Boston Red Sox)
Netherlands: Wladimir Balentien (Free Agent)
Nicaragua: Jonathan Loaisiga (New York Yankees), Erasmo Ramirez (Free Agent), Mark Vientos (New York Mets)
Puerto Rico: Javier Baez (Detroit Tigers), Jose Berrios (Toronto Blue Jays), Carlos Correa (Free Agent), Alexis Diaz (Cincinnati Reds), Edwin Diaz (New York Mets), Mychal Givens (Free Agent), Kike Hernandez (Boston Red Sox), Joe Jimenez (Detroit Tigers), Alex Lange (Detroit Tigers), Francisco Lindor (New York Mets), Jorge Lopez (Minnesota Twins), Seth Lugo (Free Agent), Martin Maldonado (Houston Astros), MJ Melendez (Kansas City Royals), Jose Miranda (Minnesota Twins), Jovani Moran (Minnesota Twins), Emilio Pagan (Minnesota Twins), Roberto Perez (Free Agent), Edwin Rios (Los Angeles Dodgers), Emmanuel Rivera (Arizona Diamondbacks), Eddie Rosario (Atlanta Braves), Neftali Soto (Yokohoma DeNA BayStars, NPB), Marcus Stroman (Chicago Cubs), Christian Vazquez (Free Agent)
United States: Pete Alonso (New York Mets), Tim Anderson (Chicago White Sox), Nolan Arenado (St. Louis Cardinals), David Bednar (Pittsburgh Pirates), Mookie Betts (Los Angeles Dodgers), Paul Goldschmidt (St. Louis Cardinals), Bryce Harper (Philadelphia Phillies), Merrill Kelly (Arizona Diamondbacks), Cedric Mullins (Baltimore Orioles), Ryan Pressly (Houston Astros), J.T. Realmuto (Philadelphia Phillies), Will Smith (Los Angeles Dodgers), Trevor Story (Boston Red Sox), Dillon Tate (Baltimore Orioles), Mike Trout (Los Angeles Angels), Kyle Tucker (Houston Astros), Trea Turner (Free Agent), Devin Williams (Milwaukee Brewers), Bobby Witt Jr. (Kansas City Royals)
Venezuela: Ronald Acuna Jr. (Atlanta Braves), Jose Altuve (Houston Astros), Jose Alvarado (Philadelphia Phillies), Miguel Cabrera (Detroit Tigers), Andres Gimenez (Cleveland Guardians), Pablo Lopez (Miami Marlins), Jesus Luzardo (Miami Marlins), German Marquez (Colorado Rockies), Salvador Perez (Kansas City Royals), Anthony Santander (Baltimore Orioles), Ranger Suarez (Philadelphia Phillies)