I don't understand how Jo has won 300 matches. Doesn't tally with ITF figures by some distance... what else are they including in the 300 total?
The ITF total is for: "Career Singles (ATP*/WTA Tour and ITF Pro Circuit main draw)" i.e. does not include qualifying wins at any level
Adding in the various qualifying wins throughout Johanna's career accounts for the delta between the ITF's number, 236, and the stated 300. The ITF figure also won't yet include any wins from this week - they add them once the players current tournament is completed (i.e. usually on Mondays).
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Data I post, opinions I offer, 'facts' I assert, are almost certainly all stupidly wrong.