Harry Finch made his maiden Championship hundred to help put Sussex in a good position against Middlesex on the second day at Hove.
Finch scored a fine 103, his third first-class hundred, and reached the landmark with his 13th boundary, a pull off off-spinner Ollie Rayner.
He was out shortly afterwards, lbw to a ball from James Harris which kept low after facing 201 balls.
Harris then picked up his fourth wicket when David Wiese (16) edged behind but Middlesex were frustrated by a last-wicket stand of 53 between Ollie Robinson, who reached a 55-ball half-century just before tea, and George Garton, whose 22 not out was a career-best. At the interval Sussex were 323-9, a lead of 93.
Earlier, Finch and Michael Burgess (45) had shared 94 for the seventh wicket before Burgess became Hilton Cartwright's third victim.
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