Question: Ian Darke and Martin Tyler are known to be commentators for what sport?

Context articles: Martin Tyler
Ian Darke
Jacob Hård
Mark Hughes (journalist)
Ian Proctor
Manchester Wall
Meaghan Martin
Kevin Martin (curler)
Martin &amp; Orloff
Tony Marchant (cyclist)

Martin Tyler (born 14 September 1945) is an English football commentator.
 In 2003, he was voted the FA Premier League Commentator of the Decade.
Ian Darke (b. 1950) is an English association football and boxing commentator who currently works for BT Sport and ESPN.
 Darke was previously one of Sky's "Big Four" football commentators alongside Martin Tyler, Alan Parry and Rob Hawthorne.
 He was also the main commentator for Sky's big boxing fights and along with Jim Watt, covered some of the biggest fights involving British boxers.
Bror Sven "Jacob" Hård af Segerstad, professionally known as Jacob Hård (born 5 January 1955) is a Swedish sport journalist.
 He started his career at Radiosporten on Sveriges Radio in 1980 to then start working for SVT.
 Hård is one of Sweden's most known sports commentators as he has commentated skiing and athletics events since the 1980s.
 Jacob Hård is also known as the voice of Bo A Orm in Lilla Sportspegelns animated series Zoolympiska spelen.
 He also voiced Tintin in the Swedish dub for the film Solens tempel.
Mark P. Hughes is the Grand Prix editor for "Motor Sport" magazine, a position he has held since the start of 2014.
 He is also an F1 correspondent for "The Sunday Times" and technical editor for the renowned motor racing annual, "Autocourse".
 Hughes also provides analysis for British television coverage of Formula One, currently working in the role of technical analyst for Sky Sports following his previous role as commentary box producer for the BBC's coverage, in case commentators David Coulthard and Martin Brundle miss anything on track.
 He worked in a similar role for ITV when they had the rights to F1, assisting Brundle and James Allen.
 He has also written articles that have been published in "The Daily Telegraph".
Ian Douglas Ben Proctor, FRSA, known as Ian Proctor, (12 July 1918 – 23 July 1992) was a prolific designer of both sailing dinghies and cruisers.
 His pioneering aluminium mast designs also revolutionised the sport of sailing.
Manchester Wall, located in downtown Richmond, Virginia, U.S., is one of central Virginia's premier rock climbing areas, offering multiple routes for trad climbing, sport climbing, and top roping.
 The sixty-foot granite wall is a remnant of the Richmond and Petersburg Railroad Bridge which spanned the James River for much of the nineteenth century.
 The climbing area is located on the south side of the James River and is accessible by foot from the north via Brown's Island and the T. Tyler Potterfield Memorial bridge, also known as the Brown's Island Dam Walk.
 There are also two parking lots that allow walk-up access from the south; one on W 7th Street and Semmes Avenue, and the Floodwall parking lot located at the south end of the Mayo Bridge.
 The routes offered at Manchester Wall, and its 3 adjacent pillars, are superb for recreational and experienced climbers alike.
Meaghan Jette Martin ( ; born February 17, 1992) is an American actress and singer.
 She was best known for her role as Tess Tyler in the Disney Channel television film, "Camp Rock" and .
 Martin starred in the ABC Family television series, "10 Things I Hate About You" as Bianca Stratford.
 Martin also guest stars on "The Coppertop Flop Show".
 Martin is also known for lending her voice for Naminé in the video game series "Kingdom Hearts" as well as voicing and motion capturing Jessica from the video game "Until Dawn".
Kevin Martin (born July 31, 1966), nicknamed "The Old Bear" and "K-Mart", is a retired Canadian curler from Edmonton.
 He is considered by many commentators and former and current curlers to be the greatest curler of all time.
 He is also known for his rivalry with Glenn Howard from 2007-2014, perhaps the best two team rivalry in Canadian curling history, and his rivalry with Sweden's Peja Lindholm from 1997-2006, perhaps the best ever mens Canada-Europe rivalry.
Martin & Orloff is a 2002 feature film written by and starring Matt Walsh and Ian Roberts (Walsh & Roberts are best known as half of the Upright Citizens Brigade comedy troupe) along with Ian's wife Katie Roberts.
 The film was produced and directed by Lawrence Blume and features an ensemble cast of alternative comedians including H. Jon Benjamin, David Cross, Andy Richter, Matt Besser, Amy Poehler, Tina Fey, Janeane Garofalo and Rachel Dratch, as well as actress Kim Raver as Orloff's girlfriend.
Anthony John Marchant {'1': ", '2': ", '3': ", '4': "} , also known as "Tippy" Marchant (born 28 August 1937) is a former Australian track cyclist who along with Ian Browne won the 2000 m tandem event at the 1956 Summer Olympics in Melbourne.
 Marchant had little formal training and only took up the sport at the age of 16 because his friends liked the sport.
 In 1955, Marchant shot to prominence after only two years in the sport, winning the 500 m time trial and the 5 mile event at the Junior Australian Championships.
 This resulted him being approached by Browne to team up in early 1956 and they promptly won the tandem event at the national championships to earn national selection.
 The pair were eliminated after losing their first two races but were given a reprieve when the Soviet Union pair were hospitalised in a crash and forced to withdraw.
 Thereafter Marchant and Browne were unbeaten and progressed to an unlikely Olympic gold.
 In 1957, Marchant retired to play Australian rules football, again basing his decision on his friends' interests.
 In 1958 he made a brief comeback as a professional, but with only sporadic success, he retired in 1961.