CREATE TABLE table_59552 ("Rider" TEXT, "Bike" TEXT, "Laps" FLOAT, "Time" TEXT, "Grid" FLOAT)

What is the highest Laps, when Bike is 'Yamaha YZF-R1', when Rider is 'David Checa', and when Grid is greater than 18?
SELECT MAX("Laps") FROM table_59552 WHERE "Bike" = 'yamaha yzf-r1' AND "Rider" = 'david checa' AND "Grid" > '18'
SELECT MAX("Laps") FROM "table_59552" WHERE "Bike" = 'yamaha yzf-r1' AND "Grid" > '18' AND "Rider" = 'david checa'