Johnson has a career high ATP singles ranking of World No.

He also has a career high doubles ranking of World No.

[1] Johnson made his ATP main draw debut at the 2021 Delray Beach Open on hard course in Florida, where he was granted entry into the main doubles draw partnering his twin brother Hunter Johnson.

Johnson has reached 20 career doubles finals, with a record of 12 wins and 8 losses all coming at the ITF Futures level.

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