The Dallas Mavericks signed second-round draft pick Ricky Ledo, the club announced Wednesday.Ledo signed a four-year, $3.3 million deal, with the first two years guaranteed at $1.4 million.The Mavericks acquired the draft rights to 43rd overall pick from the Philadelphia 76ers in exchange for a 2014 second-round pick that was originally sent to the Mavericks from Boston (via Brooklyn) in a deal that also included the draft rights to 16th overall pick Lucas Nogueira. Ledo (6-foot-7, 195 pounds) attended Providence where he was ruled ineligible by the NCAA, but continued to practice with the Friars. Ledo was a Jordan All-American at South Kent (Conn.) High School where he averaged 23.4 points and 6.2 rebounds in his senior season. Scout.com ranked him as the No. 5 shooting guard and No. 17 overall prospect after his senior season of high school.Dirk’s a dadThe newest member of the Dirk Nowitzki family came into the world Wednesday when the Mavericks forward’s wife, Jessica, gave birth to their first child — a daughter.Nowitzki, 35, had said last month that he expected to be a father. Meanwhile, last week owner Mark Cuban had suggested that Nowitzki hire a “night nurse.” By the way, the Mavs’ training camp starts in less than three months.Nowitzki’s baby comes just two days after Prince William and Duchess Kate had a baby boy in London. — Dwain PriceBriefly • Thunder: Oklahoma City re-signed guard Derek Fisher. The 38-year-old has spent parts of the past two seasons with the Thunder, averaging 4.5 points in 44 regular-season games. He has averaged 7.1 points in 31 playoff games for them. • Knicks: New York reached an agreement to bring back Kenyon Martin, the power forward’s agent, Andy Miller, said. The Knicks have only minimum contracts left to sign free agents, so Martin will get a one-year deal for roughly $1.4 million — the minimum for players who have played at least 10 seasons.