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===2021===
In February, Knowle competed in the [[2021 Australian Open – Men's Doubles|Australian Open]], marking his first Grand Slam appearance since 2017. Knowle and [[Lloyd Harris (tennis)|Lloyd Harris]] lost in the first round to the pairing of [[Nick Kyrgios]] and [[Thanasi Kokkinakis]].
His last ATP event was the [[2021 French Open]]. He officially retired in November 2021.<ref>https://www.atptour.com/en/news/retirees-honoured-nitto-atp-finals-2021</ref>
== Performance timelines ==
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