The end came as early as one minute, 10 seconds of the second session as Latvian Raimonds Sniedze was clearly hurt after being decked by a slashing right hook by the former Commonwealth Games gold medallist.
Fitzgerald was in the ascendancy from the outset, catching his East European rival with accurate body punching, which left him crimson-coloured round the middle.
There was little coming back by way of reply and the one-side trend continued in round two,
Fitzgerald caught Sniiedze flush.
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The man from Riga got up quickly and took a count of eight.
He was on his feet, but referee Darren Sarginson clearly saw that Sniedze was reluctant to continue and halted the contest in favour of the totally dominant Fitzgerald.