Select from matchdata with sub query

[B R]

I have a table matchData which has matchId and playerId as indexes. I also have match table which has a matchId as a index.

I’m trying to find all matchData records for a playerId but also getting the matchId of their first match. In the match table I have a datetime column called kickOff.

This returns data but is finding the wrong matchId

Result
SELECT md.playerId, COUNT(md.matchId),
MIN(m.kickOff) as MinK,
MAX(m.kickOff) as MaxK,
(SELECT `matchId` FROM `matchdata` where min(m.kickOff) limit 1) as M,
(SELECT `matchId` FROM `matchdata` ORDER BY m.kickOff ASC limit 1) as MM,
(SELECT `matchId` FROM matches WHERE `kickOff` = min(m.kickOff) limit 1) as Mmm,
(SELECT `matchId` FROM matches WHERE `kickOff` = MAX(m.kickOff) limit 1) as MX

FROM matchdata md
LEFT JOIN matches As g ON m.matchId = md.matchId
WHERE md.playerId = 936
Group By md.playerId