Ron Mrozinski Autographs

Ronald Frank Mrozinski (September 16, 1930 – October 19, 2005) was an American professional baseball player, a pitcher who played in 37 Major League Baseball games over two seasons, 1954 and 1955, for the Philadelphia Phillies. His professional career spanned fourteen years, from 1949 until 1962. Born in White Haven, Pennsylvania, he threw left-handed, batted right-handed, and was listed as 5 feet 11 inches (1.80 m) tall and 160 pounds (73 kg).
Mrozinski came up through the Phillies' organization, registering double figures in wins during each of his first four pro seasons. Recalled from Triple-A Syracuse in the middle of 1954, he got into 15 games for the Phils, four as a starter, and split two decisions with a 4.50 earned run average in 48 innings pitched. He threw one complete game; ironically, it was the game he lost, 5–2, on September 14 against the St. Louis Cardinals at Connie Mack Stadium. Mrozinski had held the Cards to two runs into the eighth inning before giving up back-to-back home runs to Red Schoendienst (a two-run job) and Rip Repulski. Ten days later, Mrozinski earned his only big-league win, going 62⁄3 innings against the eventual world champion New York Giants. In that game, Mrozinski left with a 4–2 lead, and was relieved by a Baseball Hall of Famer, Robin Roberts, who shut down the Giants for the remainder of the game to earn a save.
In 1955, he appeared in 22 games for Philadelphia, making only one start, and was winless in two decisions. He did, however, earn his only MLB save that year when he preserved a 10–8 victory over the Cardinals on June 21. The 1955 campaign was Mrozinski's only full year and his last season on a big-league roster. In his 37 games and 821⁄3 innings pitched, he allowed 87 hits and 44 bases on balls; he also struck out 44. Returning to the minors in 1957, he racked up four more years with double-digit victories, and won 119 games overall before retiring from the game.
Read more about Ron Mrozinski on Wikipedia

Affiliate disclosure: When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Traded items with a signature of Ron Mrozinski

The most expensive item with a signature of Ron Mrozinski (Ron Mrozinski Gem Mint 10 Beckett BAS Signed 1955 Bowman Autograph) was sold in March 2026 for $94.25 while the cheapest item (Ron Mrozinski signed, Philadelphia Phillies, 1950s) found a new owner for $0.99 in December 2009. The month with the most items sold (2) was December 2009 with an average selling price of $1.95 for an autographed item of Ron Mrozinski. Sold items reached their highest average selling price in March 2026 with $94.25 and the month that saw the lowest prices with $1.59 was February 2009. In average, an autographed item from Ron Mrozinski is worth $9.99.

Most recently, these items with a signature of Ron Mrozinski were sold on eBay - click here for more items.

Picture	Item Title	Price	Store
	1954 RON MROZINSKI PHILLIES OBSCURE AUTOGRAPHED 3X5 W/PHOTO d.2005 TOUGHER!	$4.99
	1955 Bowman Baseball Signed #287 Ron Mrozinski Auto	$55.25
	1955 Bowman Signed #287 Ron Mrozinski Autographed Phillies Dec. 2005	$20.00
	1955 Bowman SIGNED: Ron Mrozinski, PHILLIES #287 (D.2005)	$16.50
	Autographed Brace Photo of Phillies Ron Mrozinski	$6.00
	RON MROZINSKI(Died-2005)Signed Trimmed Index Card w/8 x 11 Display w/Photo/Obit	$26.99
	Ron Mrozinski (1930-2005) signed 3x5	$2.58
	Ron Mrozinski Autographed Signed 8x10 Photo - MLB 1954-1955 Phillies - w/COA	$59.99
	Ron Mrozinski Gem Mint 10 Beckett BAS Signed 1955 Bowman Autograph	$94.25
	RON MROZINSKI PHILADELPHIA PHILLIES SIGNED AUTOGRAPHED INDEX CARD D.2005	$9.99
	Ron Mrozinski Phillies Signed/Autographed ONL Giles Baseball JSA 123001	$50.00
	Ron Mrozinski PSA DNA Vintage Signed 1955 Bowman Autograph	$83.75
	RON MROZINSKI SIGNED AUTOGRAPHED 1955 BOWMAN CARD 287 PHILADELPHIA PHILLIES	$69.49
	Ron Mrozinski signed Philadelphia Phillies Vintage George Brace Postcard	$24.00
	~RON MROZINSKI (Dec. ‘05) 1955 Bowman #287 High # SIGNED Phillies PSA/DNA~	$57.51