** Shares of Australia's Tyro Payments TYR.AX plunged
24.4% so far this week, posting its worst week since Jan. 1
** Payment terminals firm on Monday said private-equity firm
Potentia Capital walked away from its buyout proposal for Tyro
** Tyro had rejected Potentia's A$1.60 per share offer in
December that valued it at A$875 mln ($593.51 mln)
** Shares are flat on Friday
** Stock have fallen 0.77% so far this year, as of last
close
($1 = 1.4743 Australian dollars)
(Reporting by Navya Mittal in Bengaluru)
((navya.mittal@thomsonreuters.com))