San Luis Potosi Welcomes Fans Since 1980 The second-longest running tournament on the ATP Challenger Tour - behind only Tampere, Finland - the San Luis Open has welcomed players and fans since 1980. It celebrates its 33th edition in 2019. The event is an integral part of a newly-formed Mexican swing on the circuit in March and April, also including tournaments in Monterrey, Morelos, Guadalajara, Leon and Puerto Vallarta.