Jon Lester retires after epic MLB career as Red Sox, Cubs ace - Sports Illustrated
Jon Lester hit hard as Cubs lose to Athletics
MLB free-agency and trade tracker: Latest news and transactions - The Athletic
MLB rumors: Giants interested in Jon Lester in free agency once again – NBC Sports Bay Area & California
MLB free agent tracker: Where every star signs, and what the deal means
Cubs Sign Jon Lester For 6 Years, $155 Million - Bleed Cubbie Blue
Last-Minute MLB Trade Deadline Primer: Teams and Players to Watch As the Clock Winds Down
Jon Lester tells hilarious story of David Ross' mount visit - Sports Illustrated
MLB Trade Deadline Live Blog: Cubs Deal Báez, Bryant in Deadline Day Frenzy – NBC Chicago