One could forgive the top soccer players in Mexico and the United States if they feel as if they have seen quite a lot of each other recently.
When some of the best players from Mexico’s Liga MX line up against some of the biggest stars from Major League Soccer in the M.L.S. All-Star Game on Wednesday night in Los Angeles, it will not be — for a handful of them — the first time they have played important matches north of the border this summer. Whether in cross-border club competitions or in two important national team tournaments, the Nations League and Gold Cup, U.