World No.10 Navarro, who won the WTA 250 Hobart International last year, needed just 55 minutes to lift her first WTA 500 trophy, wrapping up a dominant run at the hardcourt event in Mexico, in which she didn't drop a set.
With a strong serve and powerful groundstrokes, Navarro never allowed Arango to enjoy a break point at the Yucatan Country Club, while the US Open semi-finalist won 71 per cent of points on return.
The 23-year-old became only the fifth player this century to win a WTA final with a 6-0 6-0 scoreline, and the first since Iga Swiatek's victory over Karolina Pliskova at the 2021 Italian Open.
Arango, who will reach a career-high singles world ranking of 80 on Monday, could not find her stride following a nearly three-hour three-set semi-final battle against fellow qualifier Daria Saville of Australia late on Saturday.
The Colombian world No.133 reached Sunday's decider on the back of an 11-match winning streak, including last week's winning run at the WTA 125 Cancun Open, but had to play three sets in each of her last three matches.
In Texas meantime, top seed Jessica Pegula took out the Austin Open final.
Pegula was too good for fellow American McCartney Kessler, winning 7-5 6-2 in 84 minutes, 24 hours after beating Aussie Ajla Tomljanovic in the semis.
It was Pegula's 16th final and second of the year after her runner-up finish to compatriot Madison Keys at the Adelaide International in January.
Pegula, who converted six break points to three, moved up three spots to ninth in the Live Race Ranking, while the 25-year-old Kessler entered the Top 50 from her run to the final.
Both players will look to make a big impression at the WTA1000 Indian Wells tournament this week.
With AAP.
