Longest marathon playing swingball (individual)

Longest marathon playing swingball (individual)
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Who
William Henderson, Alexander Hogstrom
What
7/35 hour(s):minute(s):second(s)
Where
Australia (Federation Square,Melbourne)
When
01 January 0001
The longest swingball marathon is 7 hr 35 min set simultaneously by William Henderson (Australia) and Alexander Hogstrom (Sweden). The attempt was organised by Tennis Australia and held at Federation Square in Melbourne, Australia, on 29 January 2008.