Without suspended striker Aleksandar Mitrovic, Newcastle looked to Joselu up front but the former Stoke forward squandered three chances to increase Newcastle's lead.
Although Xherdan Shaqiri equalised against the run of play, Lascelles, who is expected to sign a new five-year deal in the next few days, headed another excellent Ritchie cross in off the post after 68 minutes to secure the points.
(Reporting by Neil Robinson; Editing by Ken Ferris)
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