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Fields are just North of the Pier.
LAX is the most convenient airport. Other area airports (i.e., Burbank, Ontario, Long Beach, Orange County) are farther from the tournament site and normally more difficult and expensive to get to and from.  LAX Google Map link
To get from the airport to Santa Monica, players have a number of options. All major car rental agencies have a presence at LAX. Taxis are also plentiful at LAX, and rideshare apps are also options, though players will have to meet their cars at designated rideshare pickup points on the departures level. 
Additionally, players can ride by bus, which costs less than $2 (cash only) -- take the LAX departures shuttle to Parking lot C, then transfer to Santa Monica's Big Blue Bus (route 3 Northbound, leaving from LAX transit center Bay #12), which takes players directly to 4th street in Santa Monica.