The Americans defeated New Zealand, Lithuania and Senegal by an average of 29 points. Their greatest concern in trying to regain the gold medal won in 2009, 2013 and 2015 is whether they can shoot well enough to win the biggest games. Their 3-point percentage of .204 ranks 15th out of 16 teams. Iowa State’s Tyrese Haliburton has been the team’s one consistent player from long range; he is 6 of 11 through three games, although he was scoreless against Senegal. 10 of the 12 players on the roster have not made even two 3-pointers.That could be problematic against a team such as France or Serbia, which were stuck together in Group D. Although Serbia finished pool play undefeated, same as the USA, they could meet in Saturday’s semifinal round. A balanced scoring effort led a dominant second half that dropped Senegal from a six-point deficit just minutes after halftime into an 87-58 defeat Tuesday in Crete, Greece. The U.S. got 14 points each from Jalen Suggs, a point guard from Minnehaha Academy in Minneapolis and Jalen Green, a wing from Prolific Prep in California, as well as 11 points and 9 rebounds from Purdue center Trevion Williams and 10 points from Oklahoma State guard Isaac Likekele. Mississippi State power forward Reggie Perry delivered 9 points and 8 rebounds for the U.S.MORE: Zion Williamson, Ja Morant listed as Rookie of the Year favoritesThe U.S. outscored Senegal by 27 points in the second half.The Americans did a poor job on the boards, allowing Senegal to bring down 31 offensive rebounds, 50 percent of the available total. They made up for that by forcing 27 turnovers. Three games. Three wins. Three blowouts. But that doesn’t make pool play of the 2019 FIBA U19 World Cup any different than most of these tournaments for the United States junior national team.What always has been decisive for USA Basketball has been the medal rounds, which start Wednesday, with the U.S. seeded as the No. 1 team in Group A against Group B fourth-place team Latvia. The Americans stand four wins from regaining the U19 world championship that has belonged to Canada since RJ Barrett beat them almost singlehandedly in 2017.