Guillermo Andrés Rivera Aránguiz (; born 2 February 1989) is a Chilean former professional tennis player. Rivera represented Chile in March 2011 against the United States, making his Davis Cup debut by playing the fifth rubber against John Isner, losing the match 3–6, 7–6, 5–7..Guillermo Rivera entregó su mejor juego pero sucumbió frente a John Isner Cooperativa, 3 June 2011. (Spanish) It would be the only Davis Cup match of his career.
Singles finals Legend (singles)Challengers (0–0)Futures (7–13) OutcomeNo.DateTournamentSurfaceOpponentScoreRunner-up1.19 April 2009Argentina F1Clay Guido Pella3–6, 4–6Runner-up2.14 June 2009Argentina F8Clay Marco Trungelliti 6–4, 2–6, 1–5 RetRunner-up3.11 October 2009Chile F1Clay Jorge Aguilar 6–7(7–9), 2–6Winner1. 14 June 2010Argentina F9Clay Maximiliano Estévez6–3, 3–6, 6–3Runner-up4.22 August 2010Colombia F1Clay Sebastián Decoud4–6, 3–6Runner-up5.29 August 2010 Colombia F2Clay Sebastián Decoud6–7(6–8), 5–7Winner2.18 October 2010Chile F1Clay Mauricio Echazú6–2, 4–6, 7–5Runner-up6.1 November 2010Chile F2Clay Guillermo Hormazábal5–7, 2–6Winner3.15 November 2010 Chile F5Clay Pablo Galdón6–2, 6–3Runner-up7.28 March 2011Chile F1Clay Stefano Travaglia2–6, 4–6Runner-up8.20 June 2011 Chile F4Clay Cristóbal Saavedra-Corvalán4–5 RetRunner-up9.15 August 2011Colombia F3Clay Eduardo Struvay2–6, 6–7(7–9)Winner4.14 November 2011Chile F13Clay Hans Podlipnik6–4, 6–4Runner-up10.20 February 2012Chile F3Clay Gerald Melzer6–7(4–7), 3–6Runner-up11.28 May 2012Chile F6Clay Cristóbal Saavedra-Corvalán4–6, 1–6Runner-up12.4 June 2012Chile F7Clay Jorge Aguilar6–7(4–7), 4–6Winner5.29 October 2012Chile F11Clay Gustavo Guerses7–6(7–3), 6–0Winner6.24 November 2012Chile F12Clay Gianluigi Quinzi6–4, 6–4Runner-up13.10 December 2012Chile F15Clay Jorge Aguilar7–5, 3–6, 3–6Winner7.6 June 2014Bulgaria F14Clay Tihomir Grozdanov5–7, 6–3, 6–1
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